I do recommend anything OEM first and foremost because they fit and are typically pretty much a plug and play item.
The MACH edition focus sedan (I believe 2k2 correct me here if i'm wrong here) has Ford OEM HID's as well as what Rochvegas has said, there is a Euro Appearance SVT package.
You can also check out companies like BATinc and a few other online companies that specialize in Focus parts.
Best of luck to you
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