thairish
Observer
The rubber is concave on the back side and keeps water away from the holes. The holes are painted and well sealed with the plastic plug and screw. I doubt water could get in there. From the dust behind the original tape on my G500 side moldings, I don't think that is any more weather proof of a design.
MB makes plugs for the the outer holes on the 461 side rail trim. Part number A0029971486