This is where I found mine:
How to find the Security Keyless Keypad Code on the 1995-2001 Ford Explorer or Mountaineer and how to use the Keypad functions. The factory code is also printed on a label which is installed on the Remote Anti-theft Personality (RAP) Module. This is the module that controls the keyless entry system. It is located in the left rear quarter behind the removable panel (see photo). You will need to turn the two thumb screws counter clockwise and take the plastic panel off to be able to see the unit. A flashlight may be helpful in seeing the code. You are looking for the module and the 5 digit code on it.
