1970 Duster base model slant 6 rear differential 2070051 spider kit

The only difference will be it has a 4 inch bolt circle diameter and the brakes I have seen on the large bolt circle 7-1/4 are usually wider but the overall wheel mount surface length has been the same. But I imagine your probably just going to use the spider and side gears from the donor. That’s the route I took unless I was changing the ratios, too.