| Item | Part No. | Part Name | Qty | Serial No. |
| 157 140 H1 | VALVE ASSEMBLY, AIR HORN | |||
| 1 | 158 012 H1 | STEM, VALVE | ||
| 2 | 878 202 C1 | GROMMET, VALVE | ||
| 3 | 158 013 H1 | VALVE | ||
| 4 | 158 014 H1 | SEAT, SPRING | ||
| 5 | 158 015 H1 | SPRING, VALVE | ||
| 6 | 145 986 H1 | PLATE, STRAINER | ||
| 7 | 158 016 H1 | BUTTON, VALVE | ||
| 8 | 103 376 | PIN, COTTER | ||
| 9 | (NSS) | BODY, VALVE | ||
| 10 | (NSS) | CAP, VALVE |