If one or both of your door windows are no longer operable, there's a good chance the OEM pot metal pivot pin has sheared off. Rennline now offers the only heat treated pivot pin on the market. Typically, you need to know whether or not the slot is parallel to the notch on the back, but Rennline's pivot pins include both the parallel and perpendicular slots to reduce the chances of ordering the incorrect part. All you need to know is the length of your pivot pin before ordering. Alternatively, order both lengths and return the pin that you don't need. (1 pivot pin included)