Eary VS. Late A-body rear end widths

Since there were no large bolt A body 8 3/4”, I would say that the offset of the aftermarket large bolt axles are made to accomodate the offset of B body brakes, making them slightly wider at the flange. Now, the front track of a 74 and later A body is wider, so I assume trust the rear was slightly widened to better sync that together.