| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| GATES | K121039HD | Direct Cross Interchange | 10 |
| GATES | K121039 | Direct Cross Interchange | 10 |
| CARQUEST | K121039HD | Direct Cross Interchange | 8 |
| CARQUEST | K121039 | Direct Cross Interchange | 8 |
| Dynacraft | D11085222 | Direct Cross Interchange | 5 |
| DAYCO | 5121040 | Direct Cross Interchange | 5 |
| Dynacraft | D8410003122640 | Direct Cross Interchange | 5 |
| ACDelco | K121039HD | Direct Cross Interchange | 5 |
| ACDelco | 12K1039 | Direct Cross Interchange | 5 |
| CUMMINS | 4121039 | Direct Cross Interchange | 1 |
| Dynacraft | 4121039RPDYC | Direct Cross Interchange | 1 |
| Dynacraft | 3122640 | Direct Cross Interchange | 1 |
| Dynacraft | 12PK2640 | Direct Cross Interchange | 1 |
| Dynacraft | 122640 | Direct Cross Interchange | 1 |
| Metric Standard | 12PK2640 | Indirect Cross Interchange | 4 |
| NAPA | 25121039HD | Indirect Cross Interchange | 4 |
| NAPA | 25121039 | Indirect Cross Interchange | 4 |
| DAYCO | 1128K12 | Indirect Cross Interchange | 4 |
| DAYCO | 1040K12 | Indirect Cross Interchange | 4 |
| Dynacraft | 4121039RP | Indirect Cross Interchange | 4 |
| CUMMINS | 3103848 | Indirect Cross Interchange | 4 |
| GOODYEAR | 4121039 | Indirect Cross Interchange | 4 |
| Size Designation | 12PK2640 | Indirect Cross Interchange | 4 |
| Dynacraft | D11065222 | Indirect Cross Interchange | 4 |
| Dynacraft | D1108D8410003122640 | Indirect Cross Interchange | 4 |