Could it be a Harris tank?? Would cost a fortune to have custom made.
Take a look at my other Interesting spares. Most of my spares are old and used and may have use related marks/wear. The item "Vintage classic Triumph bsa Honda special alloy racer racing Petrol tank.Harris" is in sale since Sunday, December 8, 2019. This item is in the category "Vehicle Parts & Accessories\Motorcycle Parts\Air Intake & Fuel Delivery\Fuel Tanks". The seller is "mulfor_8" and is located in rugby. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Czech republic, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Liechtenstein.