This is a MTD Troy-Bilt double pulley part number 619-04124 or GW-1483.

This replaces the following part numbers: 

1483
619-04124

GW-1483

This pulley fits a 3/4" shaft.

The smaller pulley is about 3 1/4" in diameter.

The larger pulley is about 4" in diameter.

We have access to many more MTD & Troy-Bilt parts, so if you can't find what you are looking for, please feel free to contact us to see if we can list it for you.

Please let us know if you have any further questions!