Something I found doing a Google Search. 1952 1953 Ford or Mercury Turn Signal Switch will work for 1954. Macs sells Switches for those Applications. U might have a look at their Switches. In some cases a small Mod to a Switch will adapt them to another Vehicle. Do U not have a Switch now? You may be able to carefully take it apart and fix it.

  

I am looking for a turn signal switch for a 1954 Mercury Sport Coup. Does any one out there know where to find this unicorn? I have looked all over internet, with no luck.