according to my '76 factory service manual, disc brake cars only came with 10x2.5" rear drums. 10" drum brake cars (what mine was, with a 11/75 build date) come with 9" rear drums and small bolt pattern. '73 up I've only seen 10x2.5" listed as the rear drums on BBP A bodies. heck, looking on rockauto I can't find ANY 10x1.75" rear brake applications in mopars going back to '64....
here's a drum for a 10x1.75", application is a 1970 AMC hornet with disc brake fronts.....might be worth a shot?
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