Jack,
Is this gas tank needed for the 1939 GMC "Tow Truck" you posted pictures of in the "Electrical Bay" forum
Jack Ryan's 1939 GMC Tow Truck???
Helps to provide as much detail (adding the truck Model info would help) in your post so folks can better try and answer your question.
As noted in fellow Bolter's replies above, cleaning/sealing your tank is probably the best/least expensive choice as finding a reasonably priced tank that will fit in the original spot without having to make a bunch of modifications may be difficult.
Dan
