DO NOT TRANSFER THE RESISTOR! Although, this will allow the FAST to recognize the new sensor, it is the calibration for the sensor. They don't just put a randon resistor in each sensor. I have come across a couple of cars where they transferred the resistor and their O2 readings were off. You have about a 1 in 16 chance of it being the correct resistor.
If you can't find what you need, we sell the correct sensors with the universal calibration for both the Classic FAST and the XFI's.