If you have a beginning of last century/boardtrack project on your mind or already on your lift, this ultra retro 3.5 gallon 2-piece tank may be what you need. It was originally designed for Paughco frame #128S5-USP and commissioned by US Chopper for their rolling chassis project.
The tank can be used for all fuel, or half oil and half fuel, and is made from 16-gauge steel. Each tank is sold with, letting petcock fittings, crossover line fittings and threaded gas caps and bungs (not installed) letting you the freedom of positioning them where you want. Retails for $625.95. Order calling 775-246-5738 at Paughco