Have a 64 1/2 mustang I bought in California 18 years ago. Havn't driven it in 10 years. Finally started playing with it and decided to really check out the date code on the door. Looked it up on the web and it said made in March 65. I thought it had to be made in early 64 to be a 64 1/2. Have all the 64 stuff. Like Generator instead of alternator, no backup lights, lip on hood instead of fold. Had the head light switch go bad and bought one for a 65 mustang and it didn't fit. Had to go back and get a 64 falcon headlight switch. What makes a 64 1/2 a 64 1/2 ????