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First off welcome to FTE lots of great people and information around here
You can try transfer flow, they make auxillary and replacement fuel tanks along with improved fuel fillneck assemblies. I know they make a replacement for pickups and chassis cabs. Give them a call and see what they have, they are always adding new products.
Buy the TFF tank and harpoon it at the time of installation, I love my tank ...wish I would have "done" the mod when I could....ug...but the tank is cool