7.25 drum to drum measurement

72bluNblu said
If it’s a BBP 7.25 the drum to drum should be 56.75”

There are a few 7.25/8.25 measurements here

An accurate 8 3/4" rear axle width list

Also note, the 7.25 is narrower than the A-body 8 3/4 when considering wheel backspace.

Thank you, as ever, lots of good advice. Am thinking i need to measure in any case....but.....

Two things:

Am not sure if i have a BBP, i think it might be SBP, as this is the stock 1973 axel. Am not sure why Quick Performance need the measurement but think best i get it up on a ramp and double check but going by your comments on the backspace this got me thinking! Am presuming it might be better to provide the 8 3/4 drum to drum measurement - see photos and point 2 for further reasons?
- If that does make sense - @72bluNblu I didn't see a measurement for a 1973 on your shared post link.
So leading on from this, i have measured the outside of the wheel to the edge of the arch - the rear sits a long way in (second photo), so thinking i'd be better giving them the 8 3/4 measurements in any matter - as the rear wheel sits nearly 1.5" inside the arch.

What do you think - imagine i could come out a little wider on the rear?