well... I finally got it done, I tried first BMW dealership but they were so disorganized (i.e. not knowing how to give me an estimate at first, screwing my appointment, not knowing how to tell what my glass was) sigh... I decided to go with a glass shop.

They told me exactly what my options were, and told me exactly as some of you did about the purple hue, which I didn't have (my X5 is a 3,0 bare bones).

So, I saved 400 bucks, the dealer was going to put the same thing for 800.00.

Excellent installation btw, I guess doing glass only makes them the experts.