1964 Barracuda door locks w/key

66-68 Door locks wont fit a 64. They also look a little different. I have compared 66-68 locks to the 65 and earlier locks. I have a 66 and a 65 car. The hole in the door for the locks is smaller on your 64. Its my guess that you could open up the hole a little bit to get the lock to fit and that it would work the door but I haven't tried it or fully investigated it to see if it would work. You can get early locks sets but they are about twice the price of the 66-68 lock sets.