For anyone wanting to convert the A body from 5x4 over to 5x4.5

I'm pretty sure after 72 when the big bolt pattern came out the 7 1/4 was still available. So BBP axles should be readily available as well as the whole 7 1/4. The 8 1/4 is also a good choice. But as you know the A-body 8 3/4 was always SBP.