IIRC, there are essentially 2 different types for the Miata- A short shifter (where the shifter is simply shortened between the fulcrum and the knob to lower the knob) and a short throw shifter (where the distance between the fulcrum and the bottom end of the shifter is lengthened to shorten the throw). While I have not tried either one, I have heard mixed reviews on both and have known people with each type who ended up going back to stock.