I am having the same issue with my 04. The car has a universal harness, so wiring should already be there. All you need is headlight switch, fogs, grill, and relays. Assuming its about the same between the two models. Here's my thread:
http://www.focusfanatics.com/forum/showthread.php?t=175350
http://www.focusfanatics.com/forum/showthread.php?t=175350