A 5-speed shift knob can only be used on a 5-speed car. Shift knobs are specially designed to work with the type of transmission your car comes with. While it might be tempting to order a 5 speed knob for an automatic car, this simply will not work. Shift knobs must be ordered specifically for the car they are needed for.
For more info, see How to Install an Automatic Shift Knob.