I think gas tanks for 68-72 A bodies are a dime a dozen. I've seen a bunch of vendors carry them. Have you done the old google search?
Too bad you weren't in central Pa...I have a brand new tank I can't use as both of my cars have fuel cells..
I have a '71 stainless tank I'd sell - Was installed in a car but never had gas put in it: $175 Also have a very nice condition used '71 tank: $75 I could’ve handed you the used one in BG.
Set up on the website an email reminder when they get back in stock. I’ve bought several tanks that way.