The 2 best places I have found are FSwerks (very reputable, very good with the focus) and Central Florida Motorsports. If they don't have a part for your car, it probably doesn't exist. TireRack is great for Wheels, Tires, Suspension, and Brakes as well.
Also, next time, feel free to start a new thread instead of commenting on an existing one, you'll get more answers that way. Or, in case you didnt see it, there is a search function too :P
Welcome to Focus Fanatics!!
Originally Posted by BertST
Hop on in babe! No really, you're gonna have to hop in. Roll Cage.
ROTM June '13, PNW Crew #42, SR #245, Rally Rev #02