Backing plate offset differences?

I am converting to the larger 2.5" style. I have two rear that have been re-drilled but still sport the original 4" holes. I had the flange opening enlarged on one in an attempt to use it on an after market axle. If you can use them I would let them go cheap. Neither need turning and have fresh cast paint on them. Let me know.

I personally don't need any drums. I replaced all mine and stocked another spare set for future use when I saw this problem coming. I am just looking for answers that will help out all the others that are now stuck in the trap and can't find something to install on there sbp set up.