I agree . I also have had and still do have some examples of both disc and 4 wheel drum cars and all have the 10 x 1 3/4 rear shoes. Now the rear wheel cylinders are different between 4 wheel drum as opposed to front disc with rear drum optioned cars. I am located in Canada also but don't think that would make any difference. Maybe I'm wrong but likewise never seen any A body 8 3/4 small bolt rear end with 2 1/2 shoes.