Some guys say that they are matched to your ecu and that you should use the same one that is currently on the car. But I see that others have purchased the "cheaper" one and used it without any problems. If you don't have the original one, just get the most economical one. They are simple variable resistors anyway. They just show a change in voltage to the ecu so I would think any one would work barring phyisical limitations/interferance.