So the two A-body widths are:
The small bolt 8 3/4 width and the late model A-body big bolt width.
So we know that the 1.75 wide small bolt brake backing plates wont work with a large bolt 8 3/4 axle. Because the small bolt and big bolt axles have different widths from the bearing to were the wheel bolts on. Using the big bolt axles widens the small bolt 8 3/4 width. Make'n it work with what I have, mentality.
The late model A-body have a different width, it is narrower than the small bolt 8 3/4, and allowing a 15x7 wheel to fit in a duster wheel well. This is the one I prefer because it has its advantages especially when shorting an housing.