OEM MTD WORM GEAR
MTD: 917-04861,917-0528A, 917-0528, 717-0528
 
(917-05861 IS THE NEWEST PART NUMBER ON THIS PART)
  Auger gear for many Craftsman, Troybilt, Cub Cadet, MTD built snowblowers
1 7/8" OD X 3/4" ID, 5/8" W- 20 Teeth