1965 Galaxie 500. I have the Ford parts/diagram manual and the only part number for the Rear Backing plate is C2AZ-2248-A. Specs say it is a "1/2-20 x 1 3/16" however, the ones I have on the car (i stripped one during disassembly) are "3/8-20 x 1 3/16". The 1/2 ones obviously won't fit. Anyone have any part numbers on a 3/8 backing plate bolt?