Wow now you can cut over two lanes of traffic instead of just one and can see that jerk driving in your blind spot.

I brought a mirror from this eBay seller before for my Audi. I notice that he has mirrors for the E53. The mirror quality is not OEM, but it just a mirror and the heating element worked on my Audi and that was the reason for replacing the mirror.

00 06 BMW x5 Series E53 Heated Left Driver Door Mirror Glass | eBay