I took the black plastic dead pedal off my 2007 coupe to see how it was attached. Looks like they just cut holes in the plastic under the carpet and added metal clips to screw the two bolts into. The part numbers that I got directly off the part are different than those that were posted earlier. Looks like M-B part numbers.

Black Dead pedal:
A193 684 00 77

Two bolt covers:
A193 682 00 16

Looks like it would be simple to add, but you would probably need new floor mats.