Nice car... Where do you get black wheel arch trims?
They are actually the Mercedes mud flaps, I fitted some myself about 6 months ago
They cost £17.77 a pair from the main dealer, part No below for the C Class (W202)
Q 3 40 20270 Mudflap Front
Q 3 40 20280 Mudflap Rear
For £35 for a full set they seam to be good value and blend in extremly well on a Black car