Those links lead to a selection tool and not to any rims you may have selected. I don't think that tool allows hot linking like you are trying to do; all links seem to reset the tool to nothing. Just pointing that out.
Anyway, we don't use wheel offset in discussions on this forum all that much. The much more commonly used measurement is the rim's backspacing. Most stock TJ rims were 15x7 or 15x8 with 5.5" of backspacing.
Backspacing tells you roughly how far out a rim will protrude from the axle. So a backspacing of 3.75" would be a rim that sticks out 1.75" farther than the same one with the stock BS of 5.5" (which has the tires fully within the flares).
It seems that rims that are 8" wide with a 12.5" tire work best with between 4.5" and 3.5" of backspacing.
The TJ bolt pattern is 5 bolts in a ring that is 4.5" in diameter. (Through the centers, I think.)
That is expressed as 5 on 4.5" or 5x4.5, or for the metric nuts out there: 5x114.3mm. (Some sites will only display in mm for some reason.)