| That is called a windshield cowl. The part number you're looking for is: 51718208483. Here is a diagram:
Please note that this is a large, in length, item. This means it typically costs extra to ship from everywhere, myself included. I'd check with a local place to see if they have it in stock to save some money. Good luck!
Last edited by Mike @ TheBMWPartStore; 10-22-2012 at 12:01 PM.