| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| NEWTEK | D521 | Direct Cross Interchange | 8 |
| AUTO EXTRA | AXOD521 | Direct Cross Interchange | 3 |
| AUTO EXTRA | AXMD521 | Direct Cross Interchange | 3 |
| AUTO EXTRA | AXCD521 | Direct Cross Interchange | 3 |
| FEDERATED | MD521 | Direct Cross Interchange | 3 |
| FEDERATED | D521 | Direct Cross Interchange | 3 |
| FEDERATED | CD521 | Direct Cross Interchange | 3 |
| GUARDIAN | 65521 | Indirect Cross Interchange | 1 |
| Inwood | S521 | Indirect Cross Interchange | 1 |
| Inwood | DMX521 | Indirect Cross Interchange | 1 |
| Inwood | D521 | Indirect Cross Interchange | 1 |