| Item | Part No. | Part Name | Qty | Serial No. |
| 20S-57-00030 | SEAT ASS'Y | 18001- | ||
| 1 | 205-57-62121 | CUSHION,BACK | 18001- | |
| 2 | 20S-57-12110 | SEAT,CUSHION | 18001- | |
| 3 | 155-57-12181 | LEVER | 18001- | |
| 4 | 201-57-21130 | PLATE | 18001- | |
| 5 | 01010-51025 | BOLT | 18001- | |
| 6 | 01602-21030 | WASHER,SPRING | 18001- | |
| 7 | 203-57-21330 | SPACER | 18001- | |
| 8 | 01010-51025 | BOLT | 18001- | |
| 9 | 01602-21030 | WASHER,SPRING | 18001- | |
| 10 | 20S-57-12131 | PLATE | 18001- | |
| 11 | 20S-57-12141 | PLATE | 18001- | |
| 12 | 201-57-21250 | CUSHION | 18001- | |
| 13 | 01010-50825 | BOLT | 18001- | |
| 14 | 01602-20825 | WASHER,SPRING | 18001- | |
| 15 | 01643-30823 | WASHER | 18001- | |
| 16 | 20S-57-12310 | SUSPENSION ASS'Y | 18001- | |
| 17 | 20D-43-13570 | KNOB | 18001- | |
| 18 | 01010-51020 | BOLT | 18001- | |
| 19 | 01602-21030 | WASHER,SPRING | 18001- | |
| 20 | 20T-54-26130 | NUT | 18001- | |
| 21 | 01580-11210 | NUT | 18001- | |
| 22 | 01602-21236 | WASHER,SPRING | 18001- | |
| 23 | 20S-57-12320 | COVER | 18001- | |
| 24 | 20S-57-12330 | PLATE | 18001- | |
| 25 | 20S-57-12340 | PLATE | 18001- | |
| 26 | 01220-40610 | SCREW | 18001- | |
| 27 | 01641-20608 | WASHER | 18001- | |
| 28 | 20S-57-21140 | COVER | 18001- | |
| 29 | 01010-51020 | BOLT | 18001- | |
| 30 | 01602-21030 | WASHER,SPRING | 18001- | |
| 31 | 01643-31032 | WASHER | 18001- |