Ford 9 offset question

[67rstbkt]

I'm attempting to determine the axle offset measurement for the axles that came with my Ford 9 rear end. I believe it's a truck unit; it came with the larger drum brakes, 31 spline axles, and 3.25" axle tubes. I have the bearings removed, but I'm having trouble determining if it's 2 1/4" or 2 3/8"

I guess my question is, did these axles come with either of the two offsets? If they only came with one, then that would obviously answer my question by elimination. If they came in both offsets, can anyone help me out with a good way to get an accurate measurement?

[67rstbkt]

Forget it, figured it out. Looks like I have 2 and 3/8"