What is the difference between 1955 Ford and 1955 Mercury passenger gas tanks?Is it the filler neck?
Can a 1955 Ford tank easily be modified to fit a 1954 or 1955 Mercury?
I think the 1956 Ford and Mercury tanks are identical, and has the sending unit more in the middle.
Was that to get more reliable fuel readings under acceleration or when climbing a hill, or...?

What about the stainless repro tanks?

1955 Mercury