I had some kind of issue with them on my '68 RR and can't remember what it was. I could only at the time find OE type Raybestos drums at a Federated Auto parts store along with the correct Raybestos brake shoes. I think it had something to do the width of the brake shoes or how far the drum went on and was hitting the backing plate. I think I ended up with a .020" or so shim over the center of the hub? The part numbers are on the box labels, both from Federated.