Rooster, you're close.
It's the 70s that can go either way. There was a running change during production to wider axles.
The later axles will fit in the early housings, but like was said, they are too long by 3/4 inch. What some guys are doing is fabricating a 3/4 inch spacer that goes between the axle housing flange and the brake backing plate. Then bolt the backing plate on with long bolts. This effectively moves the brakes out 3/4 inch to line up with the longer axles.
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