The BAKER Hydraulic Side Cover can be used as an upgrade to convert your bike from a mechanical cable style actuator, to the smooth action of a hydraulic. It has a slim design that adds the toughness of billet with the innovation of a BAKER product to your Big Twin. We use a 1.5” diameter, double sealed, steel piston to work flawlessly with an 11/16” bore hydraulic master cylinder. It is designed to fit stock 5-speeds, stock 6-speeds, the BAKER DD5, DD6, OD6, DD7 and GrudgeBox. More info here.