I put an aftermarket set on my first focus a few years back when I first got it as it was a bit noisy and they were knackered again when I sold it about 18 months later, the car did have a hard life though and did about 30k in that time!

I'd try a set of genuine ford ones, I put some on a mate's mondeo a couple of months back and they were only a couple of quid more than the pattern part ones.