[Baywatch]

I put Historic Tags on my 79 928. It was simple.
Here's the info needed

To be registered as a historic vehicle (class L), your vehicle must be a passenger vehicle, motorcycle or truck (with a GVWR of 10,000 pounds or less): be 20 calendar years old or older and must not have been substantially altered, remodeled or remanufactured from the manufacturers original design.

A vehicle registered as historic cannot be used for general daily transportation, or primarily for the transportation of passengers or property on highways. It can only be used in exhibitions, club activities, parades, tours, occasional transportation and similar uses. A trailer does not qualify for historic registration.