Did I do something wrong? I had a cracked rear drum so I thought I would simply buy some new drums. Not so easy...I had to order them online. I measured my drum to be sure and came up with 10x2. I ordered a pair of Raybestos rear drums, 10x2 (see picture of carton). Me being naive, painted and installed them without looking closely. The drums started rubbing the back plates.....nice. I pull them off and then use the tape measure (better late than never?) and behold..there is a 1/4" difference in the overall width and the surface area where the pads ride. Is this a common issue or did they send the wrong drums?