As far as I know there was no "master key" for Ford (HURD) locks. Very few 32-35 locking hub caps had a visible key code. If it did, it was on the rear of the lock cylinder on the small cap that held the 3 locking fingers in place. If your cap is off the wheel and has the number you can get a key cut to that code. If there is no code present, the lock cylinder can be re-pinned and a new key cut. If you have any questions or I can be of further assistance give me a call @ 845 457 3546 Phil