look here:

http://www.xoutpost.com/articles/x5/...es-bmw-x5.html

I have had these in my X from about a week after I found this link. Don't know if they are still available but worth a try. You just stick the Velcro pad to the glass in the rear screen and rear quarters and hey presto. I never take them out as they provide extra security screening for the cargo area and also further reduce the glare from following headlights over what the auto-dimming mirror can do alone (and that's pretty good).

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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream