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If I get mine back on both wheels anytime soon and test ride it I will give you the ones I don't use. If you have some hole saws and some aluminum plate they would be easy to make. The I.D. is 2- 3/16" and the O.D. is 3" . The ones that were given to me are 1/8, 3/16, and 1/4" and i am using the 1/4 to start.