11/16" ID pinion bushing. 8 ribs, w/o tapped hole top for end oiling. 1/4" generator mount holes with 1/4" hardware. Mounting holes must be drilled to 5/16" for use with1958-up generators. Cast 356-T6 extra strong aluminum cam covers in the same burnished finish as S&S crankcases. CNC precision machined to offer close tolerances. Improves crankcase ventilation and oil-air mist separation via a larger, redesigned baffle chamber. Bushings are installed and reamed to factory specifications. Note 1: Kit includes a gear cover gasket & hardware. Note 2: Will not fit Side Valve models.