Hey guys I'm new here so I'll start by saying hi...anyway I'm in the process of making my 79 k10 road worthy again and what better place to start than the brakes, one small problem I can't find a replacement backing plate for my rear passenger side drum. The truck has a 12 bolt rear and the backing plate has a 12" diameter. Any info on where I can get one of these would be so helpful...all I can find is 9" ones. Thanks guys.