| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| SKF | 6521 | Direct Cross Interchange | 1 |
| NAVISTAR | CR6521 | Indirect Cross Interchange | 1 |
| TIMKEN | 6521 | Indirect Cross Interchange | 1 |
| TIMKEN | 481533 | Indirect Cross Interchange | 1 |
| TIMKEN | 481528 | Indirect Cross Interchange | 1 |
| TIMKEN | 481096 | Indirect Cross Interchange | 1 |
| TIMKEN | 451533 | Indirect Cross Interchange | 1 |
| TIMKEN | 451096 | Indirect Cross Interchange | 1 |
| PACCAR | 6521CHR | Indirect Cross Interchange | 1 |
| RELIANCE | 58217 | Indirect Cross Interchange | 1 |
| RELIANCE | 4048321BF | Indirect Cross Interchange | 1 |
| FREIGHTLINER | CHR6521 | Indirect Cross Interchange | 1 |
| Precision Seals & Bearings | 481528 | Indirect Cross Interchange | 1 |
| DT Components | 481528 | Indirect Cross Interchange | 1 |
| TRANSCOM | 065112SB | Indirect Cross Interchange | 1 |
| JM CLIPPER | 14845LPD | Indirect Cross Interchange | 1 |
| TROSTEL | A86484S | Indirect Cross Interchange | 1 |
| L&S Bearing | 716521 | Indirect Cross Interchange | 1 |
| MACK | 6521 | Indirect Cross Interchange | 1 |
| MACK | 14586521 | Indirect Cross Interchange | 1 |
| GM | 8149695 | Indirect Cross Interchange | 1 |
| FORD | 96586521 | Indirect Cross Interchange | 1 |
| NSN | 5330008427157 | Indirect Cross Interchange | 1 |
| NSN | 5330004949966 | Indirect Cross Interchange | 1 |
| NSN | 5330004187728 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | 481533 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | 481528 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | 481096 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | 451533 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | 451096 | Indirect Cross Interchange | 1 |
| CARQUEST | 481528 | Indirect Cross Interchange | 1 |