What is this Hubcap from?

I had got a pair of these from a friend and he didn't know what they are from there are no center in them it appears to be a removable one like a Cadillac style but I am not sure what they are from I have bullets for them but i would like to find 2 more Thanks for the help.

 

53-4 Caddy

 

Thanks VooDoo I was looking for some ID on line but they don't show the ribs like these have but they looked very much like those year Caddys to m e but just want to make sure.

 

It's definitely Caddy, but NOT a '53...........may be a '54 or some other year

Ray

 

So is it a 54 or 55 then?

 

looks like a 54-55 to me

 

Its a 55. Look in my buick album u'll see it with a big fatty bullet for a center