Narrow Mustang Wassell "Alien Teardrop Style" Chopper Bobber Custom Build Gas Tank - Steel - 2.2 Gallon - Harley Motorcycle Cafe Racer Fuel Cell Petrol Fabricated from 18 Gauge HRPO Steel with heavy duty 10 Gauge mounting tabs. Flush gas cap mount for 1982/later screw-in style gas caps (not included). Two 1/4 NPT petcock bungs on the rear of the tank. 2.2 Gallon capacity. 2-3/4 wide tunnel.