Question

[MDFarms]

Good afternoon fellow GM Enthusiasts

I have a question, hope my explanation is clear enough below. My local parts store ordered me new rotors for my K10 Project a few months back. When I went to put them on today they slide about 1/2 way in and the outer part of hub is hitting the cast inside rotor. It appears that the rotor inside cutout is about 1/4 too small? Am I missing something obvious? Could be the rotors were stamped wrong? Not sure but has me wondering. Anyone tell me the outside diameter of the hub? Mine is mounted and I don’t have big enough calipers to measure. Anyone have a part number for rotors that will work?

The date stamps on axle housing and ring are late 1971 and it’s a Dana 44 front axle.