2001 SLK 230
If your headlights start to build up moisture behind the lens, the part you need is 170-826-02-80 described as SEAL, HD14B. $28.13. The same seal is used on both the right and the left side. The schematics are wrong at the dealer, at least they are for the 2001 model. This part number is transposed on the diagram with the black seal that goes between the headlight housing and the hood/fender.