if you mean the actual tail light lenses, I have a set if you want to purchase them, for cheap.
If you mean an interior light casing etc. try fastlane or partsshop.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.