Axle register size?

Robbie2734 said

The register is the center hub on the axle, the wheel has a matching hole to center it on the axle. I think they are all the same.

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I am trying to put a ford rotor on and the center hole is to small, won't fit over the register, so they all can not be the same. I can not get a mic in against the flange. I was hoping someone knew the measurement so I could research a rotor that would fit without modifying.