The ADF Rear Differential Lock Out Bushings reduce movement in the factory differential bushings by filling the void with high-quality 85a urethane rubber inserts. Manufactured in-house in the USA with custom 304 stainless steel backing washers that prevent the insert from walking out of the bushing over time. Also helps torsion rotation during the ratcheting process with Torqe Master Lockers, reducing noise and aiding smoother cornering. Note: Not compatible with the solid bushing design found on 2013-2014 Subaru Outback models.