| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| SKF | 15121T | Direct Cross Interchange | 4 |
| Precision Seals & Bearings | 15121T | Direct Cross Interchange | 2 |
| DT Components | 15121T | Direct Cross Interchange | 2 |
| McQuay-Norris | BT15121T | Indirect Cross Interchange | 3 |
| SEALED POWER | F15121T | Indirect Cross Interchange | 3 |
| TIMKEN | 15121T | Indirect Cross Interchange | 3 |
| FAG | K15121T | Indirect Cross Interchange | 3 |
| IHC | 871300R91 | Indirect Cross Interchange | 3 |
| IHC | 591803C91 | Indirect Cross Interchange | 3 |
| PERFECT CIRCLE | 15121T | Indirect Cross Interchange | 3 |
| Spicer-Dana | 550175 | Indirect Cross Interchange | 3 |
| RIV | 603422 | Indirect Cross Interchange | 3 |
| CHICAGO RAWHIDE | 15121T | Indirect Cross Interchange | 2 |
| AMC | 803907 | Indirect Cross Interchange | 2 |
| AMC | 3129313 | Indirect Cross Interchange | 2 |
| AMC | 3129131 | Indirect Cross Interchange | 2 |
| BOWER | 15121T | Indirect Cross Interchange | 1 |
| L&S Bearing | 15121T | Indirect Cross Interchange | 1 |
| NDH | 15121T | Indirect Cross Interchange | 1 |
| CR | 15121T | Indirect Cross Interchange | 1 |
| MACK | 145815121T | Indirect Cross Interchange | 1 |
| IHC | 871299R91 | Indirect Cross Interchange | 1 |
| FAG | 502613 | Indirect Cross Interchange | 1 |
| IHC | FP15121T | Indirect Cross Interchange | 1 |
| NAVISTAR | FP15121T | Indirect Cross Interchange | 1 |
| American Motors | J3129313 | Indirect Cross Interchange | 1 |
| American Motors | J3129131 | Indirect Cross Interchange | 1 |
| American Motors | J0803907 | Indirect Cross Interchange | 1 |
| American Motors | 803907 | Indirect Cross Interchange | 1 |
| American Motors | 3129313 | Indirect Cross Interchange | 1 |
| American Motors | 3129131 | Indirect Cross Interchange | 1 |
| SKF | K15121T | Indirect Cross Interchange | 1 |
| NSN | 3110008744782 | Indirect Cross Interchange | 1 |
| NAPA | 15121T | Indirect Cross Interchange | 1 |
| JEEP | 803907 | Indirect Cross Interchange | 1 |
| KENWORTH | KW1175 | Indirect Cross Interchange | 1 |
| ACDelco | 15121T | Indirect Cross Interchange | 1 |
| All Parts | 15121T | Indirect Cross Interchange | 1 |
| ABC | 15121T | Indirect Cross Interchange | 1 |