SBP 10" rear brake drums and shoes
You guys pulled up a 2012 thread. The answer is in a sticky here - 10" SPB rear drums became available this year.
I recently bought 2 from rockauto for ~$30 ea. They were cheap Chinese (Centric brand, I recall) and one has a small void on the outside of the casting, but "should work" and better than the $250 ea ones on ebay until recently.