The original axles for a '68-72 McKinnon built 12 bolt used in a B-O-P A-body application (like your '70 455 GTO) carried a different part number than the ones used in a common same year Chevy 12 bolt rear. The difference wasn't a dimension thing, so when ordering new heavier duty new axles, one can order for same year "Chevelle". Have a pair of Mosers in both of my '71 Pontiacs McKinnon built 12 bolts.
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Buzzards gotta eat... same as worms.
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