Man nam I am even more confused.. some have certain parts some dont..
I found a nice set with all the parts but guess what?? they are HALOGEN and not Bi-xeon or something that the x5 4.8is has ... you can go crazy looking for a correct set.
I found these
1.) Drivers:
BMW X5 E53 LCI 2003-2007 halogen LEFT side drivers headlight HELLA | eBay
2.) Passangers:
BMW X5 E53 LCI 2003-2007 halogen right side passenger headlight HELLA | eBay
and its $1200 for both with the parts needed and OEM (with bulbs, with actuator motor for LWR, with indicator, with low beam, with high beam, with position light...
but they are HALOGEN and not Bi-xenon.... So heh... its hard to win... and find a CORRECT PAIR for x5 4.8is that dont cost a arm and a leg