8 3/4" Flange to Flange Width??

This thought crossed my mind this morning while looking at an A-body 8 3/4 for sale on Craigslist.....

What is the flange to flange width on a 67-76 A body 8 3/4 compared to what would be in a 63-66 A body 8 3/4?

Talking backplate/bearing retainer flange. If anyone knows axle flange to axle flange, that would be nice too.

Figured I'd ask here first, lol.