Wow! Didn't expect to see this thread again!
I sold my Focus not long after replacing the spring, to a friend who then had the spring snap AGAIN. They were too embarrassed to tell me what the garage charged them to change it, but I honestly can't blame anyone for going down that route.
Sorry I don't have the part code, I tried to forget anything to do with that spring, it cost me most of the skin on my knuckles..
However I have heard people just leaving it broken, at least that way it doesn't squeak (both new and pre-broken springs very quite noisy) I would be surprised if the Mondeo is vastly different in this area..