I've got to agree there. They are a lot of money for not a lot of point. If you put HID bulbs in the fog lamps, all you will do is blind yourself in the fog as the light output will be so great, it will simply reflect the light back at you.

I have tried a couple of different types in mine, 130W ones were slightly too bright, in the end I settled for standard.

Also, good luck getting the bolts out. Most of them corrode into the captive inserts on the back of the bumper and snap when trying to remove them and are only available from Ford if I remember correctly. They are a VERY fine metric thread as well, so normal nuts are almost impossible to find. If you do get them apart, grease the thread before refitting to make it easier next time. A pair of new gaskets may not hurt either as the originals will be old and dry by now.