| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| BENDIX | R421 | Direct Cross Interchange | 1 |
| LUCAS ELECTRICAL | BS231 | Indirect Cross Interchange | 1 |
| RAYBESTOS | 421PG | Indirect Cross Interchange | 1 |
| WAGNER | PAB421 | Indirect Cross Interchange | 1 |
| AIMCO | AFR421 | Indirect Cross Interchange | 1 |
| BECK/ARNLEY | 0811489 | Indirect Cross Interchange | 1 |
| ACDelco | 17421B | Indirect Cross Interchange | 1 |
| VW | 211609537N | Indirect Cross Interchange | 1 |
| SATISFIED BRAKE PRODUCTS | B421 | Indirect Cross Interchange | 1 |
| NAPA | RS421 | Indirect Cross Interchange | 1 |
| NAPA | AB421 | Indirect Cross Interchange | 1 |
| ITM | 2110231 | Indirect Cross Interchange | 1 |
| FMSI | 8128421amp160 | Indirect Cross Interchange | 1 |
| CENTRIC | 11004210 | Indirect Cross Interchange | 1 |
| CARQUEST | GS421 | Indirect Cross Interchange | 1 |
| CARQUEST | BS421 | Indirect Cross Interchange | 1 |
| AUTOSPECIALTY | 3042101 | Indirect Cross Interchange | 1 |