There's not much out there. I know more by experience. I found a maroon "ACURA" plate on Ebay and bought it for a friend who happened to have "ACURA" registered on with a newer plate. He took the maroon plate to MVD and they told him he could use it as long as he had it registered as a customized plate.
Also found this on
Wikipedia, with reference to the maroon plates: "Still currently revalidated."
Which makes sense since you still see 1-2 a day here, even on newer cars.
As far as older plates, I found
this form to register an antique plate with a similar year car:
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