Corvette Suspension Bushings - Urethane (Set) : 1997-2004 C5 & Z06Increase handling and suspension on your 1997 to 2004 C5 or Z06 Corvette, with this bushing kit. Unlike stock bushings, this kit is made of urethane, so gas, oil and other detrimental road chemicals will not harm them and therefore allow them to last longer. Kit comes complete with bushings for the front and rear control arms. Frequently Asked Questions: What is Polyurethane? Polyurethane is a term used to describe a wide ranging family of elastomers