If you are not going to cut off the two lower tubes, then you definently need a frisco mounted tank, what type? that would totally depend on what you would really want, and if it is easy to aquire, would be great, I personally prefer frisco mounted tanks, even a tunneled tank can be friscoed with a little welding and some leather coverings afterwards makes it all that much better, I friscoed this one tank for a fellow, and what i did because he had a deep tunnel is, I mounted his coils in the area of the tunnel then covered it with tooled leather creations that is one off for that bike, cuz, i never done that before, and the owner really liked it, a lot! it is pretty cool to get creative with stuff like this! If i ever get a huge tunneled tank and do exactly that, I gues it would be cool, but, i do not like huge fuel tanks, my limit is 2 and a half gallons and that is pushing it, I really like 1 and a quarter gallon fuel tank type of adventures, my longest chop has a one and a quarter gallon fuel tank, and I absolutely love how little fuel it holds! it is a S,B,&,F prizm fuel tank, they are well known for having pin holes, and I have learned that J-B weld werx great for pin holes in fuel tanks, after I beleive six years, the J-B weld is still holding, and the only other pin holes are up too high, as my tank sits almost all the way vertical the way I got my frame going up so high to accept the five footer girder as it sits at 40 degrees, and with the last pin hole not sealed sits so high up, I cannot even get gasoline to go up there as the way it sits will not let me as well as where the fill spot is will not either, and i refuse to cut up such a cool old relic of a tank, it also has a quarter inch of paint upon it, with possibly a couple hundred colors in all the layers of paint it has, it may have deep cracks in the paint, but, I swear, someday , I will sand each panel down to a different color, to commemorate the partridge family bus, as it was way too many colors, like that bus took way too much LSD and loved it, so it showed all of these colors to prove it, at least this is what I feel the bus on that show did, yep, I really think way outside the box
Get yourself a narrowed mustang... I only say that because I have seething hatred for sportster tanks.
i feel ya...nnarrow mustangs are great...i had one on my shadow but ended up with a large weld failure in the tunnel that led to loads of fuel pouring everywhere...i ended up going with a 2.2 gal alien tank, fits the bike way better and am now in love with alien tanks