Worm Gear 917-04861 Fits MTD 20 Teeth Snowblower Auger Shaft Gear 917-0528 717-04449 Interchange Part# 917-04861, 91704861, 9170528A717-0528A, 717-0528, 7170528A7170528, 717-04449, 917-0528, 71704449, 9170528 SIZE: 1-7/8" outside diameter3/4" hole5/8" thick20 teeth Compatible with For MTD Cub Cadet 20 Tooth snowblower auger worm gear For as follow Models 24710568, 24742513, 24788190, 24788347, 2478869024788691, 24788771, 24788791, 24788830, 2478889024788955, 24788957, 24788970, 24788999, 247881900247883700, 247885500, 247885570, 247885680, 247886640247887001, 247887900, 247888301, 247888500, 247888510247888900, 247889701, 247887900G NOTE!! Please double check the part number and look at the picture to make sure this is the correct part you need before purchasing. Installation instructions are not provided with the product NOTE!! Please double check the part number and look at the picture to make sure this is the correct part you need before purchasing. Installation instructions are not provided with the product