I have a 1964 1/2 mustang and that plate starts with a "C" and my 1966 mustang starts with an "S", and my show plate for my Cals Special starts with a "V", you would need a plate that starts with probably an "E" and goes thru probably a "P", I know that these plates were probably sequenced and distributed each year to the DMV's, alot of plates that were issued to DMV's that did not get used just rolled over each year until they were all used up or replaced in 1970 by the classic Blue with Yellow Letters. Hope that helps you with your search. I personally would find a clean set of black plates and carefully scrape off the year tabs untill I got to the 1965 Tag. That tag should be I believe RED in color, 1964 was white and 1966 was yellow. Good Luck. As said in previous reply's, Ebay is the best place to find them, and Meguires does wonders to clean them up.