In case you haven't noticed already...
I have also purchased a stainless steel load edge protection. You can see it in the last 2 pictures in this thread.
Check this URL for more info (description in English further Down the page)
http://www.ebay.de/itm/BMW-X3-F25-ab-BJ-2010-Edelstahl-Profil-Ladekantenschutz-mit-Abkantung-/400330090359?ssPageName=ADME:XERPE:1123
Very happy with it.