| Factory | Number | Cross Interchange Type | Relevance |
|---|---|---|---|
| MELLING | 251S | Direct Cross Interchange | 1 |
| ELGIN | 251S | Indirect Cross Interchange | 1 |
| DYNAGEAR | D251S | Indirect Cross Interchange | 1 |
| PERFECT CIRCLE | OS251S | Indirect Cross Interchange | 1 |
| GM | 10245364 | Indirect Cross Interchange | 1 |
| SEALED POWER | 22414278 | Indirect Cross Interchange | 1 |