Reserve fuel tank?

AJ/FormS said

I think I once saw a pancake tank made to fit right in the spare-tire well; if that helps.It wasn't that long ago.

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They still make them. Big big $$$$$$$


Here's an option for the OP. Hot rod city garages sells factory repro tanks with or without the spare tire well cutout. They are aluminum. I use one of them. They are so nice.