Heh, well........I'd hate to break the bad news to you, but Ford uses two types of clips for the fuel line.
The first one is a white tab with large tang on top, those should come with the fuel filter and HAVE to be replaced every time you change the fuel filter.
Unfortunately, if you have the tab's with the screw impression on them designed for prying them out, first off, you aren't supposed to take them ALL the way out (I learned the hard way but fortunately they didn't break on me so I spread them and put them back in with no issues).
Secondly, Ford doesn't sell the clips seperate, they're integral with the fuel line, and it's expensive. But what you can do is go to a junkyard, find an '03+ Focus, CAREFULLY pry out the white clip from the fuel line (you'll need to pinch the ends with your finger to get it out while prying), then before you stick it in your Focus bend the tabs outward enough to where you can slide it in the fuel line and it won't come back out.
Don't half-ass this, if the line comes off and sprays fuel, especially on the exhaust, it will ignite.