| Item | Part No. | Part Name | Qty | Serial No. |
| 20S-57-00021 | SEAT ASS'Y | 21574- | ||
| 20S-57-00020 | SEAT ASS'Y | 18001-21573 | ||
| 1 | 205-57-72311 | CUSHION | 18001- | |
| 2 | 20S-57-21210 | CUSHION,BACK | 18001- | |
| 3 | 205-57-63510 | LEVER | 18001- | |
| 4 | 203-57-21330 | SPACER | 18001- | |
| 5 | 01010-51020 | BOLT | 18001- | |
| 6 | 01602-21030 | WASHER | 18001- | |
| 7 | 205-57-72361 | BRACKET | 18001-21573 | |
| 8 | 01010-51020 | BOLT | 18001-21573 | |
| 9 | 01010-51020 | BOLT | 21574- | |
| 01010-51050 | BOLT | 18001-21573 | ||
| 10 | 01602-21030 | WASHER,SPRING | 21574- | |
| 01602-21030 | WASHER,SPRING | 18001-21573 | ||
| 11 | 205-57-72441 | SUPPORT | 18001-21573 | |
| 12 | 205-57-72341 | REST | 18001-21573 | |
| 13 | 01010-50835 | BOLT | 18001-21573 | |
| 14 | 01602-20825 | WASHER,SPRING | 18001-21573 | |
| 15 | 205-57-72590 | SEAL | 18001-21573 | |
| 16 | 175-54-27350 | SPRING | 18001-21573 | |
| 17 | 01010-51220 | BOLT | 18001-21573 | |
| 18 | 01643-31232 | WASHER | 18001-21573 | |
| 19 | 205-57-63540 | BAR | 18001- | |
| 20 | 205-57-63520 | ADJUSTER | 18001- | |
| 21 | 205-57-63530 | ADJUSTER | 18001- | |
| 22 | 01580-11210 | NUT | 18001- | |
| 23 | 01643-31232 | WASHER | 18001- | |
| 24 | 20S-57-21130 | COVER | 18001- | |
| 25 | 01010-51020 | BOLT | 18001- | |
| 26 | 01602-21030 | WASHER,SPRING | 18001- | |
| 27 | 01643-31032 | WASHER | 18001- | |
| 28 | 01580-11210 | NUT | 18001- | |
| 29 | 01643-31232 | WASHER | 18001- |