I wonder if it had to do with the small hubcaps used and the retaining nubs on the wheels? The 1970 Nova continued to use the 68-9 dog dish and (3 retaining nub) XT rims while the 1970 Camaro used the new baby moon cap and (4 retaining nub) CL rims. 1971 saw usage of same wheels and caps for Nova and Camaro SS.
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