This tank was created from a newer style round bottomed sportster tank. Measurement from front tabs to end of rear tab is about 20 1/2", should fit up to 1 3/4" backbone diameter. I wanted to make something with more stretch to it for guys or gals running a little bit more length in their top tube. Frisco style 22mm fuel outlet will be welded off the left or right rear of the tank, buyer's choice . This tank is sold.