Axle register size?

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69MOPE

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What is the O.D. of the axle register on Mopar large bolt pattern axles? 1970 8 3/4.
 
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.
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.
 
Fords had smaller registers than Mopars. If no one comes up with it, I'll stick a dial caliper to an axle I have up in the rafters....but my axle will be for the larger bolt pattern on a B body if that makes a difference. I think the older A's are smaller.
 
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