hm...............get the 1 piece ebay's one then retrofit an OEM (like audi a4/s4) projector with OEM HID. That's what I'm doing now. It's an very very expensive project.
if you must ask, get the chrome housing. I don't like the black housing look on 5th Gen TYC. They just don't go well with the corners regardless of whether you have a depo corners or not.