Nice rig!

 

I started with a 3/4 spacer in the front of my 08 X, it wasn't enough, so I added another 3/4 spacer.... it wasn't bad. Now I have 2 1/2 in front and 3/4 in the rear and it sits pretty level. Another way to guestimate is to measure from the center of the wheel hub to the bottom of the fender front and back and compare the difference. That would give you a rough idea how much space you need. Every jeep is different based on how it is built, hard top vs soft top etc. Also, I put a spacer lift in my wife's '15 and ended up taking out the factory isolater in the back as it was ass high.

 

I'm leaning towards 1 1/2 front only. I just want it level nothing in the rear.
Lurch!!!!!!