Generally any '71 thru '76 B-body GM will interchange. Those are Caprice, Bonneville/Catalina, Delta 88, ... Some C body like Delta 98 might be different. C body like Buick Electra seem to have the same looking 8.5 rear though.
As far as ring gear diameter, it seems like cars with 400-2bbl or larger engines got the 8.5" but cars with 350 engines got a smaller one.
Too bad you're hours away. I have some posi's I'd sell $45 or so for those cars. I just parked my '73 Catalina so don't need a huge parts stockpile anymore.
Mike (SW PA)
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