I was just browsing around realoem.com and found this.

http://www.realoem.com/bmw/showparts...53&hg=51&fg=10
http://www.realoem.com/bmw/showparts...55&hg=51&fg=10

Auto-dimming outside rear view mirror. Isn't that cool. I know only the high end BMW models have this feature. Too bad the parts are so expensive. Would be cool though if I had the cash.

The odd thing is auto dimming outside mirrors are not offered as any package, option or accessories. So what do these parts exist?