My understanding is that there are three different tibbe transponders - red, light blue, and dark blue. You have the red one, obviously. Any post 96 Fiesta Mk4 or Mk5, or Mk2 Mondeo two-button remote will work. Focus will not, though - it's light blue. The next issue is, whether you can use the three button remote. If yours has the electric boot opener on it , ie it's a Ghia or has the electric opening button on the centre console, (I think V-reg onwards cars the boot remote opening button on the centre console was deleted and the three button remote introduced - then remote central locking box permitting, the 3 button remote will automatically be fully functional once it's mated to the car.

Part numbers you need, I believe are: 2-button 97BG15K601AA 3-button 98AC15K601AC, although typically, most combinations of last two letters should be fine. You've got the process for using the first two keys to get get the ecu to accept the third key. However, once this is done, you'll also need to flick the ignition on and off and on five times in six seconds until it goes into program mode - usually a beep and the immobiliser indicator light comes on. You then need to press the unlock button and possible the lock button, which should then program the remote in. Good luck!