Here in Maryland I'm running a pair of 60 plates on my 60 Comet and a pair of 62 plates on the 62. First you have to find a matched set of authentic Maryland plates, the same year of the manufacture date, of your car. Unless you have a really old car, before they had pairs, in which case you need only one plate. Then you register the car as "Historic" or "Street Rod". Next they give you a registration and a set of "Historic" or "Street Rod" plates ($50 for 2 years). If you choose to run the YOM (Year of Manufacture vanity) plates, then the DMV will run the number to make sure it's not being used. If the number is good they will issue a second registration for the YOM plates. Then you can run the YOM on the car, of course for an extra $25 fee for 2 years. Only catch is that you have to have the original "Historic" or "Street Rod" plates somewhere in the car as well as both registrations. All the Maryland plates, back then, expired 3/31 of that year regardless of issue date. The metal plates were actually stamped "Expires 3/31/**" So every year you were to renew and get new plates. I've been pulled over twice by 20 something cops who asked me "Don't you know your plates are expired" My first response is, "Damn I didn't know that." Then I have to go through the whole story and explain how the system works to the police. Kind of funny explaining the law to the police. One of the guys didn't believe me and call it in to validate my story.