If you have a MIG or TIG welder try welding it yourself.
https://metalfixes.com/how-to-weld-a-gas-tank/
OR
Send the tank to the vendor back and get a new one.
A Fordbarn SEARCH reveals this:
https://www.fordbarn.com/forum/searc...2&pp=25&page=2
I don't think the repro tanks are made to fit the OEM 40 Ford gas tank sending unit.