Home Products Engine parts Chains, Belts & Pulleys Engine Pulleys No. 2 Idler Pulley Cover 16659-31011 for Toyota 4RUNNER

Engine parts

No. 2 Idler Pulley Cover 16659-31011 for Toyota 4RUNNER

Name: No. 2 Idler Pulley Cover 16659-31011 for Toyota 4RUNNER
Brand: Lexus
SKU: 1665931011
Price: 0.53 USD
Availability: InStock

1665931011 - Engine parts

BRAND

Toyota

PART NUMBER

1665931011

GROUP NAME

Engine parts - Chains, Belts & Pulleys - Engine Pulleys

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Replacements

Alternative OE numbers related to this product.

Brand	Original OE	Replacement OE
-	1665931011	1665931010
-	1665931011	16659AD010
-	1665931011	166590C010

Compatible Models

Vehicle models currently mapped to this OE part.

Show all 177 mapped vehicle models

Filter By Brand:

#	Brand	Model
1	Lexus	Lexus - General area - LEXUS ES2##/350/300H - 201206 - 201806 - ASV6#,AVV60,GSV60
2	Lexus	Lexus - General area - LEXUS ES240/350 - 200605 - 201206 - ACV40,GSV40
3	Lexus	Lexus - General area - LEXUS GS SERIES - 201201 - 202007 - ARL10,AWL10,GRL1#,GWL10
4	Lexus	Lexus - General area - LEXUS GS30/35/43/460 - 200501 - 201112 - GRS19#,URS190,UZS190
5	Lexus	Lexus - General area - LEXUS GX400/460 - 200911 - GRJ158,URJ150
6	Lexus	Lexus - General area - LEXUS IS2###/3### - 201304 - ASE30,AVE30,GSE3
7	Lexus	Lexus - General area - LEXUS IS250/300 - 200604 - 201304 - GSE2
8	Lexus	Lexus - General area - LEXUS IS250/350/2##D - 200508 - 201304 - ALE20,GSE2
9	Lexus	Lexus - General area - LEXUS IS250C/300C - 200904 - 201507 - GSE2
10	Lexus	Lexus - General area - LEXUS IS350/300/300H/250/200T - 201304 - ASE30,AVE30,GSE3
11	Lexus	Lexus - General area - LEXUS LM350/LM300H - 202001 - AYH36,GGH31
12	Lexus	Lexus - General area - LEXUS RC3###/200T - 201409 - ASC10,AVC10,GSC10
13	Lexus	Lexus - General area - LEXUS RC350/300H/300/200T - 201409 - ASC10,AVC10,GSC10
14	Lexus	Lexus - General area - LEXUS RX270/350/450H - 200812 - 201509 - AGL10,GGL15,GYL1
15	Lexus	Lexus - General area - LEXUS RX300/330/350 - 200302 - 200812 - MCU3#,GSU35
16	Lexus	Lexus - Japan - LEXUS GS SERIES - 201112 - 202007 - ARL10,AWL10,GRL1#,GWL10
17	Lexus	Lexus - Japan - LEXUS GS460/430/350 - 200508 - 201112 - GRS19#,UZS190,URS190
18	Lexus	Lexus - Japan - LEXUS IS SERIES - 201304 - ASE30,AVE3#,GSE3#,USE3
19	Lexus	Lexus - Japan - LEXUS IS250/350 - 200508 - 201304 - GSE2
20	Lexus	Lexus - Japan - LEXUS IS250C/350C - 200904 - 201408 - GSE2
21	Lexus	Lexus - Japan - LEXUS RC SERIES - 201409 - ASC10,AVC10,GSC10
22	Lexus	Lexus - Japan - LEXUS RX270/350/450H - 200812 - 201509 - AGL10,GGL1#,GYL1
23	Lexus	Lexus - Europe - LEXUS ES2##/350/300H - 201206 - 201806 - ASV6#,AVV60,GSV60
24	Lexus	Lexus - Europe - LEXUS GS SERIES - 201201 - 201809 - ARL10,AWL10,GRL1#,GWL10
25	Lexus	Lexus - Europe - LEXUS GS30/35/43/460 - 200501 - 201112 - GRS19#,URS190,UZS190
26	Lexus	Lexus - Europe - LEXUS IS2###/3### - 201304 - ASE30,AVE30,GSE30
27	Lexus	Lexus - Europe - LEXUS IS250/350/2##D - 200508 - 201304 - ALE20,GSE2
28	Lexus	Lexus - Europe - LEXUS IS250C - 200904 - 201507 - GSE20
29	Lexus	Lexus - Europe - LEXUS RC3###/200T - 201409 - 202008 - ASC10,AVC10,GSC10
30	Lexus	Lexus - Europe - LEXUS RX270/350/450H - 200812 - 201509 - AGL10,GGL15,GYL1
31	Lexus	Lexus - Europe - LEXUS RX300/330/350 - 200302 - 200812 - MCU3#,GSU35
32	Lexus	Lexus - United States/Canada - LEXUS ES350 (NAP) - 201510 - 201807 - GSV60
33	Lexus	Lexus - United States/Canada - LEXUS ES350 - 200603 - 201206 - GSV40
34	Lexus	Lexus - United States/Canada - LEXUS ES350/300H(JPP - 201206 - 201806 - AVV60,GSV60
35	Lexus	Lexus - United States/Canada - LEXUS GS SERIES - 200501 - 201112 - GRS19#,URS190,UZS190
36	Lexus	Lexus - United States/Canada - LEXUS GS SERIES - 201112 - 202007 - ARL10,GRL1#,GWL10
37	Lexus	Lexus - United States/Canada - LEXUS IS SERIES - 201304 - ASE30,GSE3#,USE30
38	Lexus	Lexus - United States/Canada - LEXUS IS250/350 - 200508 - 201304 - GSE2
39	Lexus	Lexus - United States/Canada - LEXUS IS250C/350C - 200904 - 201507 - GSE2
40	Lexus	Lexus - United States/Canada - LEXUS RC350/300/200T - 201409 - ASC10,GSC1
41	Lexus	Lexus - United States/Canada - LEXUS RX330/350(JPP) - 200302 - 200812 - MCU3#,GSU3
42	Lexus	Lexus - United States/Canada - LEXUS RX330/350(NAP) - 200309 - 200901 - MCU3#,GSU3
43	Lexus	Lexus - United States/Canada - LEXUS RX350/450H(JPP - 200812 - 201509 - GGL1#,GYL1
44	Toyota	Toyota - General area - 4RUNNER - 200211 - 200908 - GRN21#,KZN215
45	Toyota	Toyota - General area - 4RUNNER - 200908 - GRN28
46	Toyota	Toyota - General area - ALPHARD/VELLFIRE/HV - 200804 - 201501 - ANH20,ATH20,GGH20
47	Toyota	Toyota - General area - ALPHARD/VELLFIRE/HV - 201501 - AGH30,AYH30,GGH30
48	Toyota	Toyota - General area - ALPHARD/VELLFIRE/HYBRID - 201501 - AGH30,AYH30,GGH30
49	Toyota	Toyota - General area - AVENSIS - 200811 - 201104 - AZT270
50	Toyota	Toyota - General area - COASTER (CHINA) - 201301 - GRB53,TRB53,XZB53
51	Toyota	Toyota - General area - FJ CRUISER - 200707 - GSJ15
52	Toyota	Toyota - General area - FJ CRUISER - 200707 - 202212 - GSJ15
53	Toyota	Toyota - General area - FORTUNER (SUV) - 202108 - GGN155,GUN15#,16#,LAN155,TGN156,16
54	Toyota	Toyota - General area - FORTUNER (SUV) - 202208 - GGN155,GUN15#,16#,LAN155,TGN156,166
55	Toyota	Toyota - General area - FORTUNER (SUV) - 202308 - GGN155,GUN15#,16#,TGN156,TGN166
56	Toyota	Toyota - General area - FORTUNER - 200501 - 201204 - GGN50,60,KUN5#,6#,LAN50,TGN51,61
57	Toyota	Toyota - General area - FORTUNER - 201107 - 202110 - GGN50,60,KUN5#,6#,LAN50,TGN51,61
58	Toyota	Toyota - General area - FORTUNER - 201507 - 202104 - GGN155,165,GUN15#,16#,KUN156,165,LAN155,TGN156,16
59	Toyota	Toyota - General area - FORTUNER - 202006 - 202205 - GGN155,GUN1##,LAN155,TGN1
60	Toyota	Toyota - General area - GRANVIA/HIACE/MAJESTY - 201902 - GDH30#,32#,GRH30#,32
61	Toyota	Toyota - General area - GRNVA/HIACE/MJSTY - 201902 - GDH30#,32#,GRH30#,32
62	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202108 - GGN125,GUN12#,13#,LAN125,TGN12#,13
63	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202208 - GGN125,GUN12#,13#,LAN125,TGN12#,136
64	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202308 - GG125,GUN12#,13#,TGN12#,136
65	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202308 - GGN125,GUN12#,13#,LAN125,TGN12#,136
66	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202308 - GGN125,GUN12#,13#,TGN12#,136
67	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202408 - GGN125,GUN12#,13#,LAN125,TGN12#,136
68	Toyota	Toyota - General area - HILUX (DOUBLE CAB) - 202408 - GGN125,GUN12#,13#,TGN12#,136
69	Toyota	Toyota - General area - MARK X - 201112 - 201611 - GRX130
70	Toyota	Toyota - General area - RUKUS - 201003 - 201512 - AZE151
71	Toyota	Toyota - General area - Asian Dragon: AVALON - 200501 - 201210 - GSX30
72	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER (CHINA) - 200712 - 201612 - GRJ200,URJ202,UZJ200
73	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER - 200701 - FZJ7#,GDJ7#,GDJL7#,GRJ7#,HZJ7#,VDJ7#,VDJL7
74	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER - 200701 - GDJ7#,GDJL7#,FZJ7#,GRJ7#,HZJ7#,VDJ7#,VDJL7
75	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER - 200709 - GRJ200,URJ20#,UZJ200,VDJ200
76	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER - 202104 - FJA300,GRJ300,VJA300,VJH300
77	Toyota	Toyota - General area - Land Cruiser: LAND CRUISER - 202104 - FJA300,GRJ300,VJA300
78	Toyota	Toyota - General area - Camry Hybrid: CAMRY/HYBRID (ASIA) - 200605 - 201207 - ACV4#,AHV40,GSV40
79	Toyota	Toyota - General area - Camry Hybrid/Australasian Dragon Hybrid: CAMRY/AURION/HV(ARL) - 200606 - 201110 - ACV40,AHV40,GSV40
80	Toyota	Toyota - General area - Camry Hybrid/Australasian Dragon Hybrid: CAMRY/AURION/HV(ARL) - 201110 - 201710 - ASV50,AVV50,GSV50
81	Toyota	Toyota - General area - Prado: LAND CRUISER PRADO - 200209 - 201003 - GRJ12#,KDJ120,KZJ120,LJ12#,RZJ12#,TRJ12
82	Toyota	Toyota - General area - Prado: LAND CRUISER PRADO - 200908 - 201708 - GDJ150,GRJ150,KDJ150,LJ150,TRJ15
83	Toyota	Toyota - General area - Prado: LAND CRUISER PRADO - 201005 - 202006 - GRJ150L-GKAKC,GRJ152,TRJ150L-GKEKC,TRJ152
84	Toyota	Toyota - General area - Prado: LAND CRUISER PRADO - 201708 - GDJ150,GRJ150,KDJ150,LJ150,TRJ15
85	Toyota	Toyota - General area - PREVIA: PREVIA/TARAGO - 200601 - 201910 - ACR50,GSR50
86	Toyota	Toyota - General area - Highlander: HIGHLANDER (CHINA) - 200905 - 201503 - ASU40,GSU45
87	Toyota	Toyota - General area - Highlander: HIGHLANDER (CHINA) - 201503 - ASU5#,GSU55
88	Toyota	Toyota - General area - Highlander: HIGHLANDER/KLUGER - 200705 - 201312 - GSU4
89	Toyota	Toyota - General area - Highlander: HIGHLANDER/KLUGER - 201312 - 201911 - ASU50,GSU5
90	Toyota	Toyota - General area - HELLAX: HILUX - 200408 - 201204 - GGN15,25,35,KUN1#,2#,3#,LAN15,25,35,TGN1#,26,36
91	Toyota	Toyota - General area - HELLAX: HILUX - 201107 - 202110 - GGN15,25,35,KUN1#,2#,3#,LAN15,25,35,TGN1#,26,36
92	Toyota	Toyota - General area - HELLAX: HILUX - 201505 - 202105 - GGN1##,GUN1##,KUN1##,LAN125,TGN1
93	Toyota	Toyota - General area - HELLAX: HILUX - 202006 - 202301 - GGN125,GUN1##,LAN125,TGN1
94	Toyota	Toyota - General area - Sea Lion Bus: HIACE - 200501 - 201402 - KDH2##,LH2##,TRH2
95	Toyota	Toyota - General area - Crown: CROWN (CHINA) - 200502 - 200911 - GRS18
96	Toyota	Toyota - General area - Crown: CROWN (CHINA) - 200912 - 201501 - GRS20#,UZS200
97	Toyota	Toyota - General area - Crown: CROWN (CHINA) - 201501 - 202004 - ARS212,GRS218
98	Toyota	Toyota - General area - Crown: CROWN - 200411 - 200802 - GRS182
99	Toyota	Toyota - General area - Crown: CROWN - 201009 - 201212 - GRS202
100	Toyota	Toyota - General area - Coster: COASTER (CHINA) - 201301 - GRB53,TRB53,XZB53
101	Toyota	Toyota - General area - Rong Fang: RAV4 (CHINA) - 200903 - 201307 - ACA3
102	Toyota	Toyota - General area - Rong Fang: RAV4 - 200511 - 201212 - ACA3#,ALA3#,GSA33,ZSA3
103	Toyota	Toyota - General area - Reiz: REIZ - 200510 - 201009 - GRX12
104	Toyota	Toyota - General area - Reiz: REIZ - 201009 - 201709 - GRX13
105	Toyota	Toyota - Japan - ALPHARD/VELLFIRE/HV - 200804 - 201501 - ANH2#,ATH20,GGH2
106	Toyota	Toyota - Japan - ALPHARD/VELLFIRE/HV - 201501 - AGH3#,AYH30,GGH3
107	Toyota	Toyota - Japan - BLADE - 200612 - 201204 - AZE15#,GRE156
108	Toyota	Toyota - Japan - DYNA/TOYOACE - 200107 - KDY2##,LY2##,RZY2##,TRY2
109	Toyota	Toyota - Japan - ESTIMA - 200601 - 201910 - ACR5#,GSR5
110	Toyota	Toyota - Japan - FJ CRUISER - 201011 - 201801 - GSJ15
111	Toyota	Toyota - Japan - ISIS - 200409 - 201801 - ANM1#,ZGM1#,ZNM10
112	Toyota	Toyota - Japan - MARK X ZIO - 200709 - 201310 - ANA1#,GGA10
113	Toyota	Toyota - Japan - MARK X - 200411 - 200909 - GRX12
114	Toyota	Toyota - Japan - MARK X - 200910 - 201912 - GRX13
115	Toyota	Toyota - Japan - WISH - 200301 - 200903 - ANE1#,ZNE1
116	Toyota	Toyota - Japan - Land Cruiser: LAND CRUISER - 201408 - GRJ7
117	Toyota	Toyota - Japan - Ling Fang: HARRIER - 200302 - 201207 - ACU3#,GSU3#,MCU3
118	Toyota	Toyota - Japan - Prado: LAND CRUISER PRADO - 200209 - 200908 - GRJ12#,KDJ12#,RZJ12#,TRJ12#,VZJ12
119	Toyota	Toyota - Japan - Prado: LAND CRUISER PRADO - 200908 - 201708 - GDJ15#,GRJ15#,TRJ150
120	Toyota	Toyota - Japan - HELLAX: HILUX SURF - 200211 - 200908 - GRN215,KDN215,RZN21#,TRN21#,VZN21
121	Toyota	Toyota - Japan - Sea Lion Bus: HIACE/REGIUSACE - 198908 - 200501 - KZH1##,LH1##,RZH1##,TRH1
122	Toyota	Toyota - Japan - Sea Lion Bus: HIACE/REGIUSACE - 200408 - 201312 - KDH2##,TRH2
123	Toyota	Toyota - Japan - Crown: CROWN - 200802 - 201212 - GRS20#,GWS204
124	Toyota	Toyota - Japan - Crown: CROWN/HYBRID - 201212 - 201804 - ARS210,AWS21#,GRS21#,GWS214
125	Toyota	Toyota - Japan - Crown: CROWN/MAJESTA - 200312 - 200812 - GRS18#,UZS18
126	Toyota	Toyota - Japan - Rong Fang: RAV4/VANGUARD - 200511 - 201606 - ACA3#,GSA33
127	Toyota	Toyota - Europe - Land Cruiser: LAND CRUISER - 201708 - GDJ15#,GRJ150,KDJ150,TRJ150
128	Toyota	Toyota - Europe - Land Cruiser: LAND CRUISER - 202104 - FJA300,GRJ300,VJA300
129	Toyota	Toyota - Europe - Camry: CAMRY - 200601 - 201109 - ACV40,GSV40
130	Toyota	Toyota - Europe - Camry Hybrid: CAMRY/HYBRID - 201108 - 201803 - ACV51,ASV5#,AVV50,GSV50
131	Toyota	Toyota - Europe - Prado: LAND CRUISER PRADO - 200209 - 200908 - GRJ12#,KDJ12
132	Toyota	Toyota - Europe - Prado: LAND CRUISER PRADO - 200908 - 201708 - GDJ15#,GRJ150,KDJ15
133	Toyota	Toyota - Europe - Highlander: HIGHLANDER/KLUGER - 201312 - 201911 - ASU50,GSU5
134	Toyota	Toyota - Europe - Rong Fang: RAV4 - 200511 - 201212 - ACA3#,ALA3#,GSA33,ZSA3
135	Toyota	Toyota - United States/Canada - 4RUNNER - 200208 - 200908 - GRN21#,UZN21
136	Toyota	Toyota - United States/Canada - 4RUNNER - 200908 - GRN28#,TRN28
137	Toyota	Toyota - United States/Canada - FJ CRUISER - 200601 - 201407 - GSJ1
138	Toyota	Toyota - United States/Canada - GRNVA/HIACE/MJSTY - 201902 - GDH30#,32#,GRH30#,32
139	Toyota	Toyota - United States/Canada - HILUX (DOUBLE CAB) - 202108 - GGN125,GUN12#,13#,LAN125,TGN12#,13
140	Toyota	Toyota - United States/Canada - HILUX (DOUBLE CAB) - 202208 - GGN125,GUN12#,13#,LAN125,TGN12#,136
141	Toyota	Toyota - United States/Canada - HILUX (DOUBLE CAB) - 202308 - GG125,GUN12#,13#,TGN12#,136
142	Toyota	Toyota - United States/Canada - HILUX (DOUBLE CAB) - 202308 - GGN125,GUN12#,13#,LAN125,TGN12#,136
143	Toyota	Toyota - United States/Canada - MATRIX - 200801 - 201406 - AZE14#,ZRE142
144	Toyota	Toyota - United States/Canada - SCION XB - 200703 - 201512 - AZE151
145	Toyota	Toyota - United States/Canada - TACOMA - 200409 - GRN2##,3##,TRN2
146	Toyota	Toyota - United States/Canada - Asian Dragon: AVALON - 200501 - 201210 - GSX30
147	Toyota	Toyota - United States/Canada - Land Cruiser: LAND CRUISER - 200701 - FZJ7#,GDJ7#,GDJL7#,GRJ7#,HZJ7#,VDJ7#,VDJL7
148	Toyota	Toyota - United States/Canada - Land Cruiser: LAND CRUISER - 200701 - GDJ7#,GDJL7#,FZJ7#,GRJ7#,HZJ7#,VDJ7#,VDJL7
149	Toyota	Toyota - United States/Canada - Camry: CAMRY (JPP) - 200601 - 201108 - ACV40,ASV40,GSV40
150	Toyota	Toyota - United States/Canada - Corolla: COROLLA NAP - 200801 - 201308 - AZE141,ZRE142
151	Toyota	Toyota - United States/Canada - Tundra: TUNDRA - 199902 - 200610 - GSK30,UCK3#,4#,VCK30,40
152	Toyota	Toyota - United States/Canada - Tundra: TUNDRA - 200611 - 202110 - GSK5#,UCK5#,UPK5#,USK5
153	Toyota	Toyota - United States/Canada - Senna: SIENNA - 200301 - 200912 - GSL2#,MCL2
154	Toyota	Toyota - United States/Canada - Vesper: VENZA - 200811 - 201612 - AGV1#,GGV1
155	Toyota	Toyota - United States/Canada - Highlander: HIGHLANDER (JPP) - 200705 - 201402 - ASU40,GSU4#,GVU48,MHU48
156	Toyota	Toyota - United States/Canada - Highlander: HIGHLANDER (NAP) - 200910 - 201312 - ASU40,GSU4
157	Toyota	Toyota - United States/Canada - Highlander: HIGHLANDER (NAP) - 201312 - 201911 - ASU50,GSU5#,GVU58
158	Toyota	Toyota - United States/Canada - HELLAX: HILUX - 200408 - 201204 - GGN15,25,35,KUN1#,2#,3#,LAN15,25,35,TGN1#,26,36
159	Toyota	Toyota - United States/Canada - HELLAX: HILUX - 201107 - 202110 - GGN15,25,35,KUN1#,2#,3#,LAN15,25,35,TGN1#,26,36
160	Toyota	Toyota - United States/Canada - HELLAX: HILUX - 201505 - 202105 - GGN1##,GUN1##,KUN1##,LAN125,TGN1
161	Toyota	Toyota - United States/Canada - HELLAX: HILUX - 202006 - 202301 - GGN125,GUN1##,LAN125,TGN1
162	Toyota	Toyota - United States/Canada - Sea Lion Bus: HIACE - 200501 - 201402 - KDH2##,LH2##,TRH2
163	Toyota	Toyota - United States/Canada - Rong Fang: RAV4 (JPP) - 200511 - 201212 - ACA3#,ASA3#,GSA3
164	Toyota	Toyota - United States/Canada - Rong Fang: RAV4 (NAP) - 200811 - 201301 - ASA3#,GSA3

Product Overview

This is a genuine Lexus OEM no. 2 idler wheel cover plate, OE 16659-31011, which drives the accessory belt and turns the accessory mounted on it. It fits 4RUNNER, ALPHARD/VELLFIRE/HV, ALPHARD/VELLFIRE/HYBRID, AVENSIS, BLADE and COASTER (CHINA), built from 1989 to 2024. 3 interchangeable part numbers are listed, including 16659-AD010, 16659-0C010 and 16659-31010.

Send your OE number or VIN for a wholesale quotation and worldwide shipping.

Technical Specifications

OE Number	1665931011
Part Name	No. 2 idler wheel cover plate
Brand	Toyota
Position	Outer, Front
Type	Plate, Idler Pulley Cover, No.2

OE Cross-Reference

16659-AD010	Toyota
16659-0C010	Toyota
16659-31010	Toyota

Questions and Answers

Which Toyota or Lexus vehicles is 16659-31011 used on?

16659-31011 covers 4RUNNER, ALPHARD/VELLFIRE/HV, AVENSIS, BLADE and COASTER (CHINA), with production years 1989 to 2024.

What part numbers replace 16659-31011?

Listed on this page are 3 interchangeable numbers for 16659-31011, among them 16659-AD010 (Toyota), 16659-0C010 (Toyota), 16659-31010 (Toyota).

How can I verify that 16659-31011 is a genuine Toyota part?

A genuine No. 2 Idler Wheel Cover Plate shows the Toyota number 16659-31011 on the box label with the country-of-origin marking. On the part itself, the metal carries the supplier’s mark cast or stamped next to Toyota’s own mark, not a separate printed sticker; and the part number is die-stamped or laser-etched into the metal itself rather than printed in ink, and it matches the box label. Documentation is available on request – commercial invoice, packing list and Certificate of Origin.

Is 16659-31011 a front or rear part?

This part is listed for the Outer, Front position.

How many pieces are needed for 16659-31011?

Sold as one piece per position – check the quantity required for your application.

Is the genuine part worth it compared with an aftermarket equivalent?

What the genuine item buys you is concrete: the OE heat treatment and surface finish help the part resist wear, corrosion and seizing; and the part is machined to OE tolerance, so it mounts and seats without shimming or rework. These are the aftermarket equivalents you may also see quoted.

What documentation comes with an order?

Each order can ship with the commercial invoice, the packing list and, on request, a Certificate of Origin; the part number is die-stamped or laser-etched into the metal, so you can match it against the invoice.