Possible RC longarm conversion question

I know I've seen these dimensions somewhere, but can't find them. What are the stock measurements straight up thru the centercaps to the fender flares on a stock XJ?

I know this is the modified section, the reason I ask here is I am kicking around the idea of the Rough Country longarm conversion. I see it is for at least 4" of lift. I'm almost sure I have that now, but want to be sure. I want to know if I will be able to retain my caster/pinion angles I have now. If I'm below 4" I'm afraid I will not be able to adjust the LCA's and UCA's correctly.

17.5" front 17" rear

Thanks, appreciate it!