9" for my XJ

Ok here is the problem,I went to the junk yard and got the backing plates and drums for a 9", but the hole in the center of the drum is to small for the Moser axles! the axles have a 2 7/8 hole in the center. Should I just have the drum center enlarged? I had the axles drilled at 5x4 1/2 for the wheels that I have. I can't find a ford drum with a 2 7/8 center with a 5 x4 1/2 bolt pattern.
Help..........

sounds like dremel tool time....