I know some people are interested in getting an OEM Avantgarde grill, as those replica grills from bekkers/performanceproducts are not of good quality.
Here is a detailed guide, provided by scorchie, who ordered and installed an OEM Avantgarde grill: http://www.blancmange.com/scorchie/MBZ/GRILL/
I have a contact who has a limited supply of these OEM grills for 265.00 USD. e-mail me at exocorp@hotmail.com for more information.