RockJock’s greasable Boomerang rear shackles for 1987-1995 Jeep YJ Wrangler vehicles directly replace the stock shackles with our new, heavy duty units. Our shackles feature laser cut, 1/4″ thick steel side plates that are a boomerang shape, to allow the spring eye to travel much further around the back of the vehicle for increased articulationl Additional features include Energy Suspension fluted urethane bushings to fit ProComp springs, grade 8 greasable bolts that feature zerk fittings on their heads for greasing of the bushings, and center bolt-in sleeves for added rigidity. Shackles are 4 3/4″ tall from bolt center to bolt center. Finished in corrosion proof gold zinc plating and sold in pairs.