These bushings are assembled from a combination of 4130 steel, 6061 aircraft aluminum and high impact polyethylene for maximum control and longevity. A simple but very effective part for eliminating unwanted deflection during acceleration, deceleration and cornering. They fit any standard size front leaf spring eye and come automatically installed in our road race springs. Another unique race item designed and offered only by Cobra Automotive. Grade 8 Bolt kit for front spring eye bushings available separately.