UMI Performance 70-81 GM F-Body Front A-arm Kit Delrin Bushings Tall Ball JointsUMIs 2nd Generation F Body a arm kit, P N 265253 1 is designed to make your classic cruiser feel like modern muscle. Increased positive caster combined with improved camber curve and low friction Delrin bushings make for a well tuned front end. Increased caster is achieved relocating both the upper and lower ball joints to enhance steering feel and improve high speed stability. As designed, the caster range is 5 7 degrees. The spindle pin location