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Rear Differential Mount Bushings by Beatrush
The Beatrush Rear Differential Mount Bushings, for the 2015 Subaru WRX STI, adds support for the rear differential through the use of an additional urethane bushing and aluminum spacer mount. The urethane bushing slips on top of the OEM bushing and the aluminum spacer sandwiches the bushings to the diff mount to prevent unnecessary differential movement.