| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| AutoZone | 921 | Direct Cross Interchange | 6 |
| EiKO | 921 | Direct Cross Interchange | 3 |
| AutoZone | 921LL | Direct Cross Interchange | 3 |
| EiKO | 921LL | Direct Cross Interchange | 3 |
| GE | 921 | Direct Cross Interchange | 3 |
| WAGNER | BP921 | Direct Cross Interchange | 2 |
| PARTS MASTER | PM921 | Indirect Cross Interchange | 5 |
| SYLVANIA | 921 | Indirect Cross Interchange | 5 |
| HELLA | 921 | Indirect Cross Interchange | 4 |
| PHILIPS | 921 | Indirect Cross Interchange | 3 |
| WAGNER | BP921LL | Indirect Cross Interchange | 3 |
| WAGNER | 921 | Indirect Cross Interchange | 3 |
| CARQUEST | BP921LL | Indirect Cross Interchange | 3 |
| CARQUEST | 921 | Indirect Cross Interchange | 3 |
| EiKO | 921K | Indirect Cross Interchange | 2 |
| MAGNETI MARELLI | 1AML000921 | Indirect Cross Interchange | 2 |
| PHILIPS | 921LL | Indirect Cross Interchange | 2 |
| PHILIPS | 921BC | Indirect Cross Interchange | 1 |
| PHILIPS | MBC921 | Indirect Cross Interchange | 1 |
| SYLVANIA | 921LL | Indirect Cross Interchange | 1 |
| WAGNER | 30921 | Indirect Cross Interchange | 1 |
| WAGNER | WL93474 | Indirect Cross Interchange | 1 |
| WAGNER | WL30921 | Indirect Cross Interchange | 1 |