This Sportster Frisco mount gas tank is perfect for building a 70s style chopper and will sit up higher on your backbone than the standard tank. This is the standard width version, which has similar dimensions to a stock Harley-Davidson Sportster gas tank. These 2.5 gallon gas tanks are heavy gauge steel and feature an offset gas filler bung that accepts a bayonet (a.k.a. cam style) Harley-Davidson type gas cap. These tanks feature a single 1/4 inch NPT petcock fitting at the lowest point of the tank for maximum miles on the road.