People have modified the TJ coil spacers in the past, but these days it's cheaper to just buy a set of coil spacers made for the Tracker.
You will need to adjust your camber a bit after installing the lift, the adjustment bolts can be bought at most part stores or just ordered on-line. I think we share camber bolts with a VW Rabbit, but you would need to verify that. If you plan on doing a lot of jumping/hard core wheeling you might want to use a welder to tack the adjustment bolt in place so it does not turn on hard landings.