Source for A-body 8 3/4 10x1.75 brake drums?

Summit.

These are for 10x1.75 Small bolt pattern A body 8 3/4 or 7 1/4



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10x1.75 (10x2")
They should not be refered to as 10x2 as there are 10x2 brakes out there (C body IIRC) always refer to the shoe size. Yes the drum friction surface will be wider than the shoe size, but brakes are not specked by the friction surface