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If you take it to your local ford dealer, they can pull it up with the WDS in about 5 min! or if you can locate the keyless entry module it's the face of it
Theres a link on the home page on the top that leads you to the directions for newer vehicles.
It may be in one of the same locations on your 99. Its worth a shot before paying the minimum shop labor rate for something they should provide to you for free.