| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| SKF | 21621 | Direct Cross Interchange | 1 |
| NAVISTAR | CR21621 | Indirect Cross Interchange | 1 |
| TIMKEN | 55X72X8 | Indirect Cross Interchange | 1 |
| PACCAR | 21621CHR | Indirect Cross Interchange | 1 |
| FREIGHTLINER | CHR21621 | Indirect Cross Interchange | 1 |
| Precision Seals & Bearings | 55X72X8V | Indirect Cross Interchange | 1 |
| DT Components | 55X72X8V | Indirect Cross Interchange | 1 |
| WESTON | 55X72X8R4V | Indirect Cross Interchange | 1 |
| MACK | 21621 | Indirect Cross Interchange | 1 |
| MACK | 145821621 | Indirect Cross Interchange | 1 |