| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| BENDIX | MRD921 | Direct Cross Interchange | 1 |
| AMS | S921 | Direct Cross Interchange | 1 |
| WAGNER | ZD921 | Indirect Cross Interchange | 2 |
| CENTRIC | 30109210 | Indirect Cross Interchange | 1 |
| WAGNER | MX830 | Indirect Cross Interchange | 1 |
| CENTRIC | 10409210 | Indirect Cross Interchange | 1 |
| RAYBESTOS | SGD921C | Indirect Cross Interchange | 1 |
| WAGNER | ZX921 | Indirect Cross Interchange | 1 |
| DASH 4 | CD921 | Indirect Cross Interchange | 1 |
| AMS | DMX921 | Indirect Cross Interchange | 1 |
| Morse Brake | MX921 | Indirect Cross Interchange | 1 |
| FMSI | 7822D921 | Indirect Cross Interchange | 1 |