I need a part for my Troy-Bilt Gardenway 16.5 hp lawn tractor. Its the gear at the end of the steering shaft. My current one is wore down, the gear is bare, and I cannot turn my wheels anymore. Its a Troy-Bilt Gardenway 16.5 hp lawn tractor. The model number is no longer on the tractor (should be listed under the seat, but its not), but I do have the serial #. That is: 1590915735 5 Are you able to help?