Dana Spicer Brake Shaft Retainer Bushing Assembly, These are used on heavy duty trailers with air brakes, M870, M129A3, Dana M10WH100, Dana M12WHR50-L, 3040-01-241-4818, 3040-01-241-4818, Plate; Retaining; Shaft, M12WHR50L Shaft Retainer Bushing, M10WH100, M12WHR50-L, LH Camshaft Bracket, R2B4