Mount the bars to the rear end center section and upper crossmember. If you hook it up hard enough to need wheelie bars, you are gonna have a lot of parts breakage on the jag rearend. They aren't designed to take much horsepower. Best case scenario is the tires will go up in smoke and the rear end might live a bit longer. An IRS looks kewl, but they won't take a hard hooking car with horsepower. I used to gernade Corvette half shafts and u-joints with only 350 horse.