Variations on Lowbrow's popular Sporty and Narrow Alien Tank are now available. The Sporty Frisco Mount gas tank will sit up higher on your backbone than a standard tank. These 2.5+ gallon gas tanks are top quality, nice thick steel with a center mount American style filler bung that accepts stock style screw in filler cap. The 2.1 gallon Narrow Alien Tank is also available in a dual filler style, with one functional and one dummy cam-style gas cap bungs. Dual 1/4" NPT petcock bungs at the rear. Mounting tabs front and rear are undrilled, drill for mounting on your custom chopper.