What kind of hub caps are these?

I am trying to find out where the hup caps on my father's 34 Ford cabriolet came from. He thinks they are from a Plymouth but is'nt sure. I think that they are aftermarket, but I'm not sure either.

The car hasn't changed since my dad bought it in 1978. And the guy he bought it from said he built it in the early 50's, with little done to it since then.

 

55-56 plymouth.....80% sure about that...

 

they are after market cone caps that look alot like 57 plym. caps they came in 14&15 inch caps

 

I believe they are aftermarket hubcaps made to simulate 57 Plymouth caps.The difference is the OEM caps have little squares running around the outside edge where these are plain.The 57 Plymouths were also 14" and these look to be 15's maybe.

 

Appreciate the help...They are 15".