My old interchange book shows Pontiac 59-63 front and Pontiac 59-63 rear as groups. 64 and 65 are different groups. Surprisingly there doesn't seem to be any interchangeability between any GM marques. Each is different which I would not have expected.
And on old verses new part numbers I would expect that old numbers which might be asbestos based lining would be different. When the government forced making asbestos obsolete I would expect the new lining material would be given a new number even though it would look like the same shoe.
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