ORIGINAL: kx250ryder
EDIT: I believe Kyosho uses one style and shape of shoe, and Mugen (and most other companies) use another. Make sure you get the right aluminum shoe for your application.
The kyosho shoes are the same as mugen only kyoshos have 1mm larger holes that the pins on the flywheel go through. If your running a kyosho flywheel you either need to drill mugen shoes slightly larger or just use kyosho clutch shoes.