Thanks Ridin' Green. Maybe my mower is 2+ years. I believe I had the 30/32 Vanguard to choose from. I asked my repair guy to check on the 36 for my mower. I'm sure he will find out what Ferris/Briggs suggest but he has cautioned me that he has had to make modification on what was suppose to fit in the past so i was hoping I might find real life experience here. As I recall Puppypaws suggested the 32 back when I purchased my mower, I just could not find one. Maybe the 36 was about to come out and local dealers were staying silent while clearing old stock? One other question. I am trying to figure out how this motor got ruined. I have very steep hills I ride up and down on regularly. Has anyone had trouble with an engine asked to climb steep hills?