i thought ford was the only ones with the factory keypad. i installed that piece for the customer, very easy and straight forward. you can get access to the wire code tech sheet here>>>

http://s242.photobucket.com/albums/ff279/DISTORTED_WUN/my%20X%20mods%20thread/

i have them posted there for the various X`s gen 1, 1.5, and 2, should be an easy DIY if you r handy with wiring.