Out of all the people on this site that are "in the know", i cant believe that no one offers what i do. This is a problem on just about all focus' up till 2006. Heres two pics showing the new and the old. The old is the one that has the thinner metal around the outside edge and should be replaced BEFORE it starts going bad. I carry these and will even build the new cylinder for you with a spare "blank" key and ship it to you for $65. Yes, its a real Ford cylinder and is the new one.:
