If pattern is same, you can use original, unless they send a bigger center hub (part that sticks out through the drum). Then junkyard backing plates, buy new drums, shoes and hardware ( tell the parts people it is off a 67 gtx, them and their computers are funky)
Or just have machine shop enlarge centering hole in old drums. I can't remember if there was a difference in 10" and 11" register hole.
