Replace worn or damaged urethane bushings on RockJock shackles. These are high-quality Energy Suspension Tough 88" Urethane Bushings. They have fluted inner cores to retain grease for smooth operation and longer life. These shackle bushing kits are eight piece sets and available for front and rear shackles. RockJock also offers conversion kits for owners with Pro-Comp, Black Diamond or Trail Master Spring who wish to use the superior RockJock shackles. Set of 8 bushings.