I'm assuming you've tried calling Dennis Kirk, and Shade Tree? Those parts certainly won't be in the catalog, so you'd need to contact them directly, but if they don't have them, I'm sure they can steer you in the right direction.
ok... there are a few oppotions ya got the first thing id try is goto the local junk yard the 2nd thing id do is go on line to your browser adn type in vintage snowmobile, there are a coupel of excelent resorces for "hard" to find parts, and when it comes to the older stuff youll find that most of the "ol'timers" are easy to work with as long as ya treat them with respect, after all they were riding long befor most of us were $hItN our dippers,,,when ya get ready to look for the parts ya need to have A L L the info on the clutch
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