15” wheels will not fit on these cars, and the variable is the definition of “fit.” If you cannot have the wheels turned full lock and bottom out the suspension without the tires rubbing, THE WHEELS DO NOT FIT. But if you’re the type of person who doesn’t mind having a half-assed car, set up with parts that don’t fit, 15”s are fine.
As a quick glance, the 12 bolt has two bolts on the bottom and the 10 bolt has one bolt on the bottom.
From a ’71 Nova, a posi with a 3:38 screw inside. I have owned this rear since 1981. Minus replacement axles/bearings, it has over 500k miles on it, and I have beaten the dogcrap out of it.
