| Model | Horsepower | Year(s) |
|---|---|---|
| 50ES71 | 50 | 1971 |
| 50ES72 | 50 | 1972 |
| 50ES73 | 50 | 1973 |
| 50ES74 | 50 | 1974 |
| 50ES75 | 50 | 1975 |
| 50ESL71 | 50 | 1971 |
| 50ESL72 | 50 | 1972 |
| 50ESL73 | 50 | 1973 |
| 50ESL74 | 50 | 1974 |
| 50ESL75 | 50 | 1975 |
| 50R72 | 50 | 1972 |
| 50R73 | 50 | 1973 |
| 50R77 | 50 | 1977 |
| 50R78 | 50 | 1978 |
| 50R79 | 50 | 1979 |
| 50RL72 | 50 | 1972 |
| 50RL73 | 50 | 1973 |
| 50RL77 | 50 | 1977 |
| 50RL78S | 50 | 1978 |
| 50RL79 | 50 | 1979 |