| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| SYLVANIA | 921 | Direct Cross Interchange | 13 |
| EiKO | 921 | Direct Cross Interchange | 11 |
| GE | 921 | Direct Cross Interchange | 9 |
| AutoZone | 921LL | Direct Cross Interchange | 9 |
| EiKO | 921LL | Direct Cross Interchange | 9 |
| PARTS MASTER | PM921 | Direct Cross Interchange | 7 |
| PHILIPS | 921 | Direct Cross Interchange | 6 |
| SYLVANIA | 921BP | Direct Cross Interchange | 6 |
| WAGNER | 921 | Direct Cross Interchange | 6 |
| CARQUEST | BP921LL | Direct Cross Interchange | 5 |
| CARQUEST | 921 | Direct Cross Interchange | 5 |
| HELLA | 921 | Direct Cross Interchange | 5 |
| WAGNER | BP921LL | Direct Cross Interchange | 5 |
| MAGNETI MARELLI | 1AML000921 | Direct Cross Interchange | 4 |
| PHILIPS | 921LL | Indirect Cross Interchange | 4 |
| EiKO | 921K | Indirect Cross Interchange | 3 |
| GM | 921 | Indirect Cross Interchange | 2 |
| SYLVANIA | 921LL | Indirect Cross Interchange | 1 |
| WAGNER | 40043 | Indirect Cross Interchange | 1 |
| ACDelco | L921 | Indirect Cross Interchange | 1 |
| WAGNER | BP921 | Indirect Cross Interchange | 1 |
| WAGNER | 94026 | Indirect Cross Interchange | 1 |
| WAGNER | WL94026 | Indirect Cross Interchange | 1 |
| WAGNER | WL93919 | Indirect Cross Interchange | 1 |
| WAGNER | WL93428 | Indirect Cross Interchange | 1 |
| WAGNER | WL40043 | Indirect Cross Interchange | 1 |
| WAGNER | WGT921 | Indirect Cross Interchange | 1 |
| WAGNER | TL921 | Indirect Cross Interchange | 1 |
| GM | 9098111059 | Indirect Cross Interchange | 1 |
| FORD | E6DZ13466B | Indirect Cross Interchange | 1 |
| CHRYSLER | L000921E | Indirect Cross Interchange | 1 |
| TOYOTA | 9098111059 | Indirect Cross Interchange | 1 |
| NISSAN | 267177Z000 | Indirect Cross Interchange | 1 |