Everything is different on the mini bikes, and the Compact series mini bikes are different from them. No interchange of parts. The Simplex site does have scans of the ads and some parts lists for the mini bikes. Check this site for some Simplex info. Which do you have, Compact or mini? Most parts for Simplex minis were bought from American Mfgrs. Some are still available, some are not. The 20 spoke wheels are hard to find.