I know what you mean. Once I decided I wanted skirts for my Plymouth it took a year for a reasonably priced pair to show up. Good luck in the search. You may also want to check out forwardlook.net which caters to mopars from 1955 to 1961 and has a parts for sale section.
Saw these in the cl***ifieds http://www.jalopyjournal.com/forum/showthread.php?t=853791&highlight=dodge
woohoo! found a really nice set of four, a pretty decent spare and an ok backup for my backup. they all have blue in the centers
The only difference between 55 and 56 Lancer "flipper" hubcaps is one year had blue color center detail and one year had red. I don't remember which year had witch. JTM