If you have to have new, you can still buy a GZ250 tank from Suzuki(EXPENSIVE
), or you can find them used on Ebay. I'd want to have one in hand to physically compare before I bought, though. It probably won't be a direct bolt on.
Anyone have a GZ250 tank they can compare?
Denim had a thread with a sportster tank on his that looked good, if you can dig up the thread.