Have you tried Oreilys?[/QUOTE
(A long answer to your short question, sorry.)
I believe I checked with O'Reilys but don't remember for sure. This all goes back to June of 2010 when I was looking for new front drums for the Super Bee. I do remember checking with several parts stores back then and the closest I could come to the correct center register was the NAPA drums. But even the center register on theirs was .010 too big in diameter. I went ahead and bought them, centered then on the hub, MIG spot welded the hubs to the drums on the inside then had them turned. This worked okay for 4 or 5 years but eventually the spot welds broke loose. My spot welds didn't bite into the cast iron drum material well enough.
Recently I went through the same process on the RF drum but this time used my stick welder with the correct welding rod for cast iron. Had the drum turned, then installed and tested under very heavy braking and the welds held. But things didn't work out as well with the LF drum, so temporarily I installed a good old hub and one of the original drums (it's thin) until I can find a proper and correct replacement drum.
I have not had very good results with a number of after market replacement parts in the last 7 to 8 years.