| Item | Part No. | Part Name | Qty | Serial No. |
| 20U-973-0013 | BOOM ASS'Y,1ST | 18001- | ||
| 20U-973-0012 | BOOM ASS'Y,1ST | 16432-18000 | ||
| 20U-973-0011 | BOOM ASS'Y,1ST | 14993-16431 | ||
| 20U-973-0010 | BOOM ASS'Y,1ST | 8001-14992 | ||
| 1 | \6\ | BOOM,1ST | 16432- | |
| 1 | \6\ | BOOM,1ST | 16328-16431 | |
| 1 | \6\ | BOOM,1ST | 8001-16327 | |
| 2 | 20T-70-81140 | BUSHING | 14993- | |
| 2 | 20T-70-71140 | BUSHING | 8001-14992 | |
| 3 | 07020-00675 | FITTING,GREASE | 8001- | |
| 4 | 09453-00002 | STOPPER | 8001- | |
| 5 | 01580-11210 | NUT | 8001- | |
| 6 | 20U-70-21720 | COVER | 16328- | |
| 7 | 01011-81010 | BOLT | 16328- | |
| 8 | 01010-81090 | BOLT | 16328- | |
| 9 | 01643-31032 | WASHER | 16328- | |
| 10 | 07145-00050 | SEAL,DUST | 8001- | |
| 20U-973-0022 | BOOM ASS'Y,2ND | 18001- | ||
| 20U-973-0021 | BOOM ASS'Y,2ND | 14993-18000 | ||
| 20U-973-0020 | BOOM ASS'Y,2ND | 8001-14992 | ||
| 11 | \6\ | BOOM,2ND | 14993- | |
| 11 | \6\ | BOOM,2ND | 8001-14992 | |
| 12 | 20U-70-21491 | BUSHING | 14993- | |
| 12 | 20U-70-21490 | BUSHING | 8001-14992 | |
| 13 | 07020-00000 | FITTING,GREASE | 8001- | |
| 14 | 07145-00070 | SEAL,DUST | 8001- | |
| 15 | 20U-973-2391 | BRACKET,3RD | 12772- | |
| 15 | 20U-973-2390 | BRACKET,3RD | 8001-12771 | |
| 16 | 07020-00000 | FITTING,GREASE | 8001- | |
| 20U-70-00321 | LINK ASS'Y,SUB | 14993- | ||
| 20U-70-00320 | LINK ASS'Y,SUB | 8001-14992 | ||
| 17 | \6\ | LINK,SUB | 16682- | |
| 17 | \6\ | LINK,SUB | 8001-16681 | |
| 18 | 21W-70-31130 | BUSHING | 14993- | |
| 18 | 07144-10503 | BUSHING | 8001-14992 | |
| 19 | 07145-00050 | SEAL,DUST | 8001- | |
| 20 | 07020-00900 | FITTING,GREASE | 8001- | |
| 21 | 07049-01012 | PLUG | 12772- |