Found a package in my trunk for my '06 Roadster Limited that contained the front license plate bracket, in it was a bag that the sheet says were the plugs wheel arch liner. The instruction sheet part #a 193 584 00 71 had contents of package, wiper blades, front grill lower right, screws, license bracket, plugs wheel arch liner, floor mats l/r, tool.
Dealer never installed the plugs, I followed the directions & just put them where they belong. Wonder what they are there for.

 

they are used to keep the water out of the frame.