Wilwood GS Compact Remote Master Cylinder Kit 5/8In Bore Kit Universal 260-15089 Wilwood’s new GS Compact Remote Master Cylinders are an all new rebuildable design featuring a high pressure die cast aluminum body with a protective e-coat finish. Remote cylinders feature a standard 7/16-20 threaded inlet. Internally, a refined return spring and piston assembly assures positive pressure control along with a quick and complete release. Features: Cast Aluminum Single Outlet Specifications: Master Cylinder Area: 0.