^ cman gave all the info and links that's needed...

angel eyes: H8 GP Thunder 8500k

fogs: H11 GP Thunder 8500k

Straight up replacement of the existing bulbs, no errors or tweaks needed. I haven't done the license plate yet but the pics with the resistors is what you'll have to do.

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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