John,
I may or may not have one or more correct hubcaps (the varieties are such a can of
worms on these old 36-39 Fords! Do you have a picture? I think they used every possible variation to make year changes and to have unique caps for the trucks.
Perry in Idaho email to prs518@live.com, I have many of the varieties! Coincidentally, I have also a 56 Lincoln Premiere coupe.