Frustrated because you cannot find those black plastic 10MM nut thingeys that are under the fender wells, mount the front plastic fenderwell fillers, and the rear lower valence ?
( when I bought my 2005 roadster, I found that the front filler panels had NO nuts on then )
Well, for around $16 shipped, you can get a box of 25 from :

ClipsAndFasteners.com - Automotive Retainers,Clips and Fasteners
look for "Mercedes Carpet Retainer Fits 5mm Stud"