New Energy Suspension rear strut rod bushing kit.  The strut rod is the rod that runs perpendicular to the transmission driveshaft.  This kit will do both strut bars, LH and RH.  This kit is polyurethane, which has less flex that rubber.  Bushings are red.  Fits the following:

84-87 Corvette (stock strut bars only #14048947 and #14048948)