You have a few options...To see your otions and to get BMW part numbers, go to RealOEM.com, plug in your car - but don't use VIN, use model, engine, and production month.

Look under "Vehicle Trim" and "Glazing"

you want the part number with Rain sensor = yes.

BUT, you might consider getting the "Climate Comfort" windshield (Climate Comfort = yes). This windshield has some extra layers in the glass to significantly cut down on glare and greenhouse-type heat that is generated when the car is in the sun...

If I ever need a windshield, I am getting a climate comfort.

Any decent window installer - even safe-lite can get these windshields for you.