Wow, $900.00 for a gas tank seems pricey. You should be able to get a behind the seat tank relatively inexpensivly, especially if you buy a used tank from a salvage yard or put a post here in the swap meet. Just make sure your sending unit works. The holes for the fuel line should still be there and if it's temporary, you could run a rubber fuel line. (Just watch out around the exhaust manifold or headers.) If you want a new tank, almost all of the specialty catalogs have what you need, including the extensions for the fuel tank cap. Good luck.