MC28 and MC21 calipers are different. One is threaded, the other blank (and the fork leg threaded).

Cosequently the offsets are different, so the adaptors will only work with the MC28.

Having adaptors made shouldn't be a great issue for any half decent machine shop. Looking at the rear caliper bracket Silikesguiness had made by NK recently, he would certainly be up to the task... if he has the time!
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Andy.
NSR-WORLD.COM

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