Hmmm. The aerostar thing is interesting, but, I probably can't use just the backing plates, and would need to get aerostar specific parts to load it with, including the drums; and what about the bolt pattern and offsets? The vans, trucks, and full sized cars generally came with the larger bearing housing. So, it seems, I am still in search of 2-1/2 backing plates for the small bearing rear. I've seen end to end dimension lists, but, does anyone have a list of perch to perch dimensions for the 60's cars?