This is what I had on my D3, on the piece above the no plate.
I purchased a replacement part from prestige parts and sprayed it my colour (night blue) and good as new now.
I also removed one of the roof strips, which had slight corrosion present, rubbed it down, primed and painted etc. I'm struggling to find pics of that though.
These roof strips simply push fit into a shaped rubber seat which is wedged into the roof panel - very simple to remove, but, you need to be careful with these.