Where would be the recommended place to order or buy knobbies for my 77 K-1000? Getting a spare set of wheels from a friend to mount the knobbies on so I don't have to damage my cast wheels. Also, what - where do I find the butt cheeks support Doc told me about that uses 2 liter pop bottles of extra gas? He tole me once but I lost the paper and I can't remember. Prolly going to lose the faring/windshield some fender stuff and put a splash deflector on the bottom of a sorta front fender to keep rocks & water off me and the engine from the front wheel .. So what is the favorite place to spend the $$$$?