| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| DT Components | DRK321 | Direct Cross Interchange | 5 |
| Precision Seals & Bearings | DRK321 | Direct Cross Interchange | 4 |
| FEDERAL MOGUL | RA321 | Direct Cross Interchange | 3 |
| SKF | DK321 | Direct Cross Interchange | 3 |
| SKF | SDK321 | Direct Cross Interchange | 1 |
| TIMKEN | DRK321R | Indirect Cross Interchange | 4 |
| CHICAGO RAWHIDE | DK321 | Indirect Cross Interchange | 2 |
| TIMKEN | DRK321D | Indirect Cross Interchange | 2 |
| DT Components | DRK321R | Indirect Cross Interchange | 2 |
| DT Components | DRK321D | Indirect Cross Interchange | 2 |
| MACK | 1458DK321 | Indirect Cross Interchange | 1 |