RSD's Nostalgia Hydraulic Clutch Cover is designed to convert your bike to smoother operating, hydraulic actuation. Designed to match RSD Nostalgia engine covers and completes the flow of the classic, ribbed styling Hard anodized 1.5" diameter piston for extended life Compatible with stock or aftermarket 11/16" hydraulic clutch master cylinders CNC machined from billet aluminum in the U.S.A. Easy bolt-on installation Hardware and gasket included Design-matched to other RSD Nostalgia engine covers