John, a bunch of guys at GG use "vanity" plats at the show, some people just do not want other people taking pics of their cars with their plates for whatever reason.
There is a guy at GG that is in Oakland and does a superb job on making custom plates, and pretty sure you can pay him to do whatever color on yours (he made some all brushed aluminum ones and all black ones in the past). The guy has a work truck full of plates and normally parks by the swap area, I may have a card. He also restores plates. Note that the plates he sells can not be used for registration since they are aluminum.
You can get year plats black and red already done online, i.e. year plates here for your 68 in red, about $60:
http://www.licenseplates.tv/year-built-261.html
Like the other guys mentioned, the DMV will require the year of manufacture sticker, and plates (they "may" require a month tag separately). The YOM sticker in good shape is about $30 and up, and they are unique numbers. At the DMV they will use a magnet to test your plate, check if it is available, and pretty much that is about it.
Good luck!
Gui