| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| SKF | HB21 | Direct Cross Interchange | 1 |
| DT Components | HB21 | Indirect Cross Interchange | 1 |
| PTC | PTHB21 | Indirect Cross Interchange | 1 |
| Neapco | N227021 | Indirect Cross Interchange | 1 |
| AutoZone | HB21 | Indirect Cross Interchange | 1 |
| ISUZU | 5098000390 | Indirect Cross Interchange | 1 |
| GM | 94027348 | Indirect Cross Interchange | 1 |
| PRONTO | PTHB21 | Indirect Cross Interchange | 1 |
| PRECISION AUTOMOTIVE INDUSTRIES | HB21 | Indirect Cross Interchange | 1 |
| PARTS PLUS | PHB21 | Indirect Cross Interchange | 1 |
| PARTS MASTER | PMHB21 | Indirect Cross Interchange | 1 |
| NAPA | HB21 | Indirect Cross Interchange | 1 |
| FEDERAL MOGUL | HB21 | Indirect Cross Interchange | 1 |
| CARQUEST | BHB21 | Indirect Cross Interchange | 1 |
| NATIONAL | HB21 | Indirect Cross Interchange | 1 |
| TIMKEN | HB21 | Indirect Cross Interchange | 1 |
| Precision Seals & Bearings | HB21 | Indirect Cross Interchange | 1 |