I don't know if you have the same foglight version as I have but its fairly simple to change. I have a Mazda 6 i4 with the sport package. (Canadian version) The car looks like this http://www.grohol.com/mazdamspeed6Gallery2.jpg
Crawl under the front end. There are 5 screws holding on a plastic guard under the foglight. Take them out... You can see the back of the fog light. Twist the wiring harness counter clockwise. Bingo. The bulb is out. Unclip from the wiring harness. Replace with H11-55 bulbs. Unfortunately Sylvania doesn't make any of these in the silverstar models.
Hope this helps.
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You will have to access the fog light bulb from below the vehicle. Remove the plastic clips from the wheel well cover extension that is below the fog light. Once the clips are out and the plastic cover is pull down, you should be able to see the back of the fog light. You can try to replace the fog light bulb now or remove the two 10mm bolts and slide the fog light assemble out through the front of the bumper. Turn the cover of the rear of the fog light and replace light.
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