Our aluminum gas tank is specifically designed to fit a 55-59 Chevy / GMC 1/2 ton truck and mounts from the underside up, in between the frame rails. Our tanks are light weight and provide the opportunity to remove the factory tank from behind the seat and get it out of your cab. Each tank has the provisions for a sending unit, filler hose, a 1/4″ NPT vent bunk and a fuel delivery bung, 3/8″ NPT. This tank has a 19 gallon capacity and includes mounting hardware.