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Go find a '72 to '75 Nova, and you'll see it will have an 8.5-inch 10-bolt. These rears use the same pinion-shaft diameter as a 12-bolt, and the ring gear is only 0.375 inch smaller in diameter (8.5 versus 8.875). If you buy an aftermarket limited-slip, you can use early Camaro 12-bolt 30-spline axles. You have to shave the C-clip buttons on the end of the axles by about 0.050 inch to make them work, but that's easily accomplished with a grinder.