There are several different engines in that model and year. Please verify the engine size first. These are the correct ones for your car. I recommend Denso Iridium plug as they last a very long time, save gas, and add pep. http://www.globaldenso.com/cgi-bin/global/plug/euro/4w/4w-plug.cgi?name=FOCUS+I+%2898-05%29&filename=4w-32.txt&action=search
It is probably .045".
If you're replacing the spark plugs in your car
engine, you'll need to set the gap before reseating the
spark plug. The gap is the distance electricity arcs between the ground
electrode and center electrode. The gap must be set correctly to ensure
maximum performance. Here's how to set the gap of a spark plug.
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