Working to get my 41 coupe on the road again. 3 of the 4 brakes were locked up and the drums have been troublesome trying to remove them. One of the fronts actually broke in half around the circumference. I rebuilt all 4 wheel cylinders, got my new tires mounted and ready to go However, the replacement brake drum I purchased won't go over the shoes on either of the rear sides. When I removed the wheels, I found the right rear already had an aftermarket drum and the one I purchased is a perfect match for that one. The one original rear I have fit perfectly on either side. I measured the new drum and it is in fact about an eighth of an inch smaller than the original. I am wondering if I can have the two non originals machined to the size I need. I know there must be some standards on how much can be removed or how much must remain??? Any thoughts? Or, does anyone have an original to sell?