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This is a rear bearing from Boca Bearings designed to fit the engines needing a rear bearing with dimensions of 14mm inner, 25mm outer and 6mm thick (note that the VZ-B V-Spec and OS P5 engines use a 14x25.4.x6 bearing and this one will not fit). This bearing is open to allow oil to lubricate the bearings during use.

NOTE: This bearing should be installed so that the balls face the rear of the engine (towards the backplate), in order to allow proper lubrication.