There are Bosch-type relays with 6 volt coils that will work just as well as (or probably better than) some overpriced 70-year-old OEM relay of questionable quality. There's plenty of places to hide a relay like the front of the radiator support where they're out of sight to the casual observer.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!