Use this link http://luxangeleyes.com/guides/LUX_H8_Install_X5.pdf

Ignore the extended wire and black box parts, just replace the bulb. If it doesn't sound straight forward to you, look at this DIY that has missing pictures.

http://www.xoutpost.com/bmw-sav-foru...-swap-diy.html

Apparently the E70 X5 with halogen headlights uses a H7 AE bulb. Are you wanting to upgrade to LED AE bulbs?