I actually talked to Lou Lariche about 8 months ago and he said he was going to check if he had anything from when they took over the first dealership, unfortunately nothing turned up, but key chains and license frames were not considered all that special then, similar to how you buy a new car now and they only stay on the vehicle for a short time. Lou was nice enough to send me a copy of a newspaper article chronicling how the dealership changed hands over the years, so I thought that was nice of him. I also talked to Lou's son who works at the dealership as well, and it sounds like there used to be an annual old car show at the dealership that was put on with the Eastern Michigan Camaro Club, and I thought he said the meetings were held there as well at one point.
I thought maybe if I were to able to get up to the Plymouth MI area and check out a couple of the local swap meets I might turn something up, but we now are on west coast, so I will have to wait to do so.
I bet there is probably a few guys in that area that specialize in license plates, and license frames. if anybody in the area (Kurt) sees a guy like that at one of the local meets, maybe they could pass the info on to me.