http://tinyurl.com/m772u75<P>Snowblower Worm Gear - Replaces MTD 717-1425 & 917-1425.Product Review<P> Click on the link for more reviews<P>Made to Meet Or Exceed FSP Specifications.<P>Fits 28" & 33" width snowblowers<P>1-1/2" ID, 2-7/8" OD, 1/4" key, 20 Teeth, .885" Thick.<P>