i don't believe a 1971+ rear housing would bolt up to your car. between significant generations, GM usually changed every major dimension in the car. ... i had typed that i was sure the 71+ cars were bigger ... wiki disagrees.
https://en.wikipedia.org/wiki/Buick_...1.E2.80.931976
perhaps the 1971-76 housings WOULD fit? unknown.
it is POSSIBLE that you may be able to use 71+ internals, but i wouldn't spend a whole lot of money testing this idea out. if you can grab a 71-76 gear set / housing for close to the scrap metal price, it would be worth taking a look at.
since Tom pointed out that the Riv used a Panhard bar up to 1970, we know you can't use a 66-70 Riv / Eldo / Toro housing.
but you should be able to use a housing out of pretty much any other GM big car from 1966-70.
make a rough sketch of the major attachment points on the housing you have, use a tape measure to get the rough dimensions and take that along when you go to the junk yard. anything GM from like years that matches up within a 1/2" in all your major dimensions should work.
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