I just grabbed a few pics from my 3.0si. You're definitely missing a strut(?) in addition to whatever the plug is connecting to.







I dug further and found this from realoem -> front axle suspension... so perhaps it controls your headlight aim as you turn the wheel. See if that's still working for you (aim against the garage door).

http://www.realoem.com/bmw/enUS/show...diagId=31_0796

Also, I have adaptive drive (in description of part) so maybe yours isn't really missing if you don't have adaptive drive. (And remind me never to fly through any deep puddles)

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr