Try Corvette Clocks By Roger, 24 Leisure Ln., Jackson, TN 38305, (901) 664-6120.
Or one of several other restoration services for radios, etc., advertised in the more popular Vette magazines. They have and still do use this paint in their restorations.
Also, I've seen the paint for sale in some past aftermarket Corvette suppliers in the past, I believe, but offhand don't remember which ones.
Rlm