Early B body 8 3/4 question

I have a housing that appears to be out of an early B body. Its 44 inches from spring pad center to spring pad center, and about 54 1/4 inches from flange to flange with the backing plates gone.

Looking to use this under my Gremlin bracket car, and have a question.

Are the axle bearings the same on the early housings as the 68-70 B body housings?