Dobinsons Spring & Suspension rear polyurethane leaf spring bush kit for 2005 to 2018 Toyota Tacoma 4x4 and Pre-runner models. Replaces OE bushes with high quality polyurethane for maximum vibration dampening and best cabin comfort. Bushes have unique internal diamond grease traps to maximize bush life and reduce squeaking or noise. These replace the OE bushing, or the bushing that is supplied with some leaf spring manufacturers which are prone to squeaking. Kit contains 6 bushes, for the fixed end and both shackle ends of each leaf spring (6 positions total). Only one kit is required per vehicle.This design of bushing will hold grease for longer than usual. Incorporating a recessed twin hole greasable design to ensure both halves of the polyurethane bush receive even grease distribution. Greasing polyurethane bushes not only reduces friction and wear, it also reduces the chances of corrosion on the shackle pins and reduces squeaking. Our 4x4 shackles and pins are a heavy duty design and provide simple servicing through external grease nipples.