8 1/4 width

The 5x4.5" big bolt pattern 7.25 and the 8.25 are the same width. The SBP 7.25 may be a little different from the BBP 8.25.

There's a sticky that has all the widths, including some of the 7.25 and 8.25" widths. The difference between the BBP 7.25, 8.25, and 8 3/4 is enough to change your backspace requirements if you're maxing out tire width.

An accurate 8 3/4" rear axle width list