LED factory lights are great. If you can get a full housing for the missing one including motor and yoi still have t ballast, HID is the way to go. With self leveling so they point straight while you hit bumps and dips or when brake/accel.

Oh: aim them properly. Best way is to park parallel to a brick wall and set the brightness shade on the driver side to be just below horizontal.

Most cars will have it set way too low (the passenger side level or even down) this will cut your visible range 50-70%!

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)