The fuel sending unit on mine was Made by transfer Flow Inc. out of Chino Ca. and looks like a 90 OHM, or a WHO 06. Mine had a 7 97 date below the WHO 06 . It also had a standard 5 hole mounting pattern. I suspect that if you could find a generic 90 OHM adjustable sending unit you could make it fit just fine. Test before you buy. The fuel level will need to be below the sending unit. I believe I got my unit from Beaver Parts sales and it was pricey, but I did not want to remove the old unit until I had a new unit in hand. You will also need a new gasket that did not come with my sending unit! If you have time, I would drain enough fuel, take the old unit out, and match it up with a compatible unit at a auto parts store.
Hopefully this will be hepful!