With the 12 bolt rear being original to a '70 GP, it should be a McKinnon built 12 bolt, the factory c-clip axles in the McKinnon built 12 bolts for '68-70 Buick & Olds usage & '70-72 Pontiac usage have a slightly larger diameter pilot where they go through the brake drum. A new pair of Moser 12 bolt axles for a '68-72 "Chevelle" or 70 1/2 Fbody will have a slightly smaller diameter pilot, but will work, or if concerned about the slight difference, one can run "Chevelle" style drums.
Someone was asking a month or so back about the pilot hole diameter of the different 9 1/2" rear drums, I'll pull some factory axles out of the racks & post the two measurements later this weekend.
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Buzzards gotta eat... same as worms.
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