They're available and can be found. Here is one that is on ebay.
https://www.ebay.com/itm/NOS-1964-64...ss!94590!US!-1
Put a 64 sticker on it and that should suffice. I had a friend do the same thing for a set of 67 plates. Letters/Numbers were from the same time frame, the DMV just wanted the same year stickers on the plates before they registered them to his car.
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1968 Pontiac GTO - Verdoro over Ivy Gold - 400/4-speed/3.08
1987 Pontiac Grand Prix - Sage/Sage/Sage - GM 305/Th200-4r
2004 Pontiac GTO - IBM over Black - LSx 440/6-speed/4.10 SRA - Single Digit Stick Shift
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