ENERGY SUSPENSION Hyper-Flex bushes. Proven on the race track as well as the street, these Hyperflex bushing kit sets from Energy Suspension allow you to replace your mushy rubber bushings with high performance polyurethane versions. All vehicles - front or rear-wheel drive, or 2WD or 4WD, will achieve a higher level of performance. Hyperflex components will not break down or deteriorate from exposure to oils, under car chemicals, or atmospheric conditions. They also improve appearance over the original parts. Energy Suspension don't make a 'kit' so this is put together using separate part numbers: 16.3120 (front end control arms), 16.3121 (rear end control arms), 9.13103 (tie rod boots) and then two of 7 different part numbers for the anti-roll bar bushes. Please email us immediately after you have ordered telling us the thickness of both your front and rear anti roll bar.