http://www.shopbmwusa.com/ProductDet...&ProductId=701 - that's probably what you're talking about. I'm not sure if BMW sells the parts individually (i.e. separates front, side and rear) but you can get them from Tischer separately (getbmwparts.com). You can also order here:
http://www.bmwmercedesparts.com but it's more difficult to browse than Tischer is