| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| ACDelco | 17321R | Direct Cross Interchange | 4 |
| AutoZone | 321PG | Direct Cross Interchange | 4 |
| CARQUEST | BS321 | Direct Cross Interchange | 4 |
| RAYBESTOS | 321PG | Direct Cross Interchange | 4 |
| Inwood | R321 | Indirect Cross Interchange | 4 |
| KEMPARTS | S321R | Indirect Cross Interchange | 4 |
| EIS | NX321 | Indirect Cross Interchange | 4 |
| EIS | EX321 | Indirect Cross Interchange | 4 |
| EIS | ES321R | Indirect Cross Interchange | 4 |
| WAGNER | WNA321R | Indirect Cross Interchange | 4 |
| AMERICAN REMANUFACTURING | 74321 | Indirect Cross Interchange | 4 |
| AMERICAN REMANUFACTURING | 73321 | Indirect Cross Interchange | 4 |
| BENDIX | RAF321 | Indirect Cross Interchange | 4 |
| BENDIX | R321F | Indirect Cross Interchange | 4 |
| BENDIX | R321 | Indirect Cross Interchange | 4 |
| BENDIX | AF321 | Indirect Cross Interchange | 4 |
| BENDIX | 321 | Indirect Cross Interchange | 4 |
| FEDERATED | BS321R | Indirect Cross Interchange | 4 |
| GM | 2380216 | Indirect Cross Interchange | 4 |
| GM | 2056435 | Indirect Cross Interchange | 4 |
| GM | 2056405 | Indirect Cross Interchange | 4 |
| ROCKHILL | 321R | Indirect Cross Interchange | 4 |
| RAYLOC | SS321H | Indirect Cross Interchange | 4 |
| RAYLOC | AE321HR | Indirect Cross Interchange | 4 |
| NAPA | AE321R | Indirect Cross Interchange | 4 |
| GUARDIAN | 71321R | Indirect Cross Interchange | 4 |
| FMSI | 3211245C | Indirect Cross Interchange | 4 |
| CENTRIC | 1120321 | Indirect Cross Interchange | 4 |
| WAGNER | PAB321R | Indirect Cross Interchange | 4 |
| WAGNER | ANA321R | Indirect Cross Interchange | 4 |
| WESTERN BRAKE | W321R | Indirect Cross Interchange | 4 |
| WESTERN BRAKE | AF321 | Indirect Cross Interchange | 4 |
| AIMCO | R321R | Indirect Cross Interchange | 3 |
| AIMCO | AFR321R | Indirect Cross Interchange | 3 |
| CARQUEST | BS321R | Indirect Cross Interchange | 3 |
| CENTRIC | 11203210 | Indirect Cross Interchange | 3 |
| FDP BRAKES | 321 | Indirect Cross Interchange | 2 |
| NEWTEK | NR321 | Indirect Cross Interchange | 2 |
| NEWTEK | NB321 | Indirect Cross Interchange | 2 |
| CARQUEST | RS321R | Indirect Cross Interchange | 2 |
| CARQUEST | GS321 | Indirect Cross Interchange | 2 |
| RAYBESTOS | 321RR | Indirect Cross Interchange | 2 |
| WAGNER | A321R | Indirect Cross Interchange | 2 |
| WAGNER | W321R | Indirect Cross Interchange | 2 |
| SEALED POWER | ANA321R | Indirect Cross Interchange | 2 |
| GM | 19166835 | Indirect Cross Interchange | 1 |
| GM | 18029602 | Indirect Cross Interchange | 1 |