Paul, thanks for the info. I think the real object of the YOM program in California is to allow the vehicle to display the plate as it was when the car was new. They require that the plate that you want to use have the sticker for the "year of manufacture". It took my best surgical skills and some alcohol (not vodka) to remove years of stickers and get back to the '66 sticker. That is the only way they allow you to register the car with YOM plates that were not on the car originally.
The looks of the metal tabs is a probably not the best, but they are almost completely hidden under the bumper on my '66 and the plate clearly shows only the "1966" sticker on the right side.
A friend has a 1926 Packard and probably would love to have a YOM plate that matches the year of the car.
The local DMV office took my old (much later) plates, copied the ones I wanted to register and took my money in only a couple minutes. It took almost 90 days before I got the new registration, stickers and the metal tags. I don't think the will accept repro plates in any case. Used plates and stickers are available on line and at swap meets.
I have a set of plates and serial number panels etc. that I removed from my daughters car before I scrapped it. The top sticker is from around 1998 when the car was totaled, so they are around. Next you would need the surgical skills and alcohol etc. to get back to the year you need.
Merry Christmas and Happy New Year
SWMBO's '66 Coupe 289, 2-V, C-4(Pony Interior, Rally Pac, A/C & Tiffany Stripe) & An absolutely rust free '65 289-2V C-4 coupe project. Now almost done. Only took 13+ years.