Sounds like you bought the car in IL?
Not only is the wheelbase longer the Merc body is about 4 inches wider than the Ford body.Honestly, I don't believe Mercury offered a CONVERTIBLE SEDAN in '39. Word has it that Merc DID offer one ONLY in 1940, which of course......Ford did not in '40! Here's a '40 Merc CS!
Remember, the Merc wheelbase is 4" longer than a Ford of that era. DD
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