What parts are you looking for?? If your motor only needs a tuneup then you need carb kits and sparkplugs. Orielly's carries your Champion sparkplugs. Colborn Marine, Brady, Anchor, and Travis should all have or be able to get carb kits.
Well what parts are you looking for ? I believe a tuneup on your motor consists of a sparkplug change. Everything else is solid state and only gets changed when there is a spark or charging problem.
Beyond that the tuneup is checking and adjusting,no parts usually needed.