10” Drum Brakes Options for A-Body 8-3/4 with Moser Engineering BBP Axles

OK. Now that's all cleared up, I'm in the market for a pair of used, reasonably priced 10" x 2.5" rear drum brake assemblies with backing plate (with or without drums) to fit my 8-3/4. A current ebay poster wants $500 for a rebuilt pair without drums - too rich for me, for what is supposed to be a very common rear brake size. I will be posting in the FABO and FBBO parts wanted forum. Thanks.