| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| TIMKEN | L21549 | Direct Cross Interchange | 9 |
| FAG | KL21549 | Direct Cross Interchange | 9 |
| CATERPILLAR | R1X939 | Direct Cross Interchange | 9 |
| ALLIS-CHALMERS | FEX1738 | Direct Cross Interchange | 9 |
| All Parts | L21549 | Direct Cross Interchange | 9 |
| NSN | 3110001964400 | Direct Cross Interchange | 9 |
| DEERE JOHN | 39X21946A | Direct Cross Interchange | 9 |
| SKF | L21549 | Indirect Cross Interchange | 1 |