If all you want to do is Level the Jeep front to rear. Park the Jeep on a flat even surface. Measure the distance between the ground to the bottom of the fender flare on the rear, then measure the front the same way. NOTE: when measuring trim height, Center the measuring tape at the center of the wheel.... With the front trim height measurement and the rear, calculate the difference and thats what size spacer you will need to level the Jeep. it usually only varies between 3/4 to an inch..