you can try www.silverstarrecycling.com
for used parts.
there are some other salvage yards for mercedes you can try too.
I think one is called potomac german auto and the other is called atlanta stuttgart.
I'm not 100% sure though on those two but the other one should have parts.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.