Ribbed Mustang Chopper Bobber Custom Build Gas Tank - Steel - 3.3 Gallon Capacity - 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). 3/8 NPT bung for Petcock underneath on right hand side of tank. 3.3 Gallon capacity. 2-3/4 inch wide tunnel.