I would suggest calling mower repair shops that service Ferris mowers, and although they are a repair shop not a parts store, you can probably work a deal with them. They take used units and cannibalize them so you may be able to find used parts by t...
check your local classifieds; check with a dealer who takes trade-ins. Check with an on-line site such as Craigslist or the auction sites for completed sales.
Neither he never caught them until ferris was on the door step and his sister was deciding on letting him in. They had alot of close calls though.