Torque Solution Billet Rear Differential Mount InsertsTorque Solution Billet Rear Differential Mount Inserts Applications: Mitsubishi Evolution VIII IX 2003 2006 Note: suit RS rear diff only. Non AYC These billet bushings are solid compared to the OEM rubber units. By replacing them with these 6061 Billet Pieces you are able to get rid of the unwanted slop and flexing of the stock units which allows for the power to go into rotating the tires, instead of flexing the rubber. Giving you better feedback,