How Can I Remove A 1999 Mercury Cougar Manual Shift Knob?

Question

And is there a specific size I need to find to replace it

Answer 1

Nearly all shift knobs are molded on the gear shift handle. Punch out the pin that holds the handle on, lay the handle on a hard surface and hit it with a hammer. Measure the splined shaft and rethread to the nearest size and find a knob that will fit.
Good luck to you.