Dark/black headliner on W164?
Their are many 1/8th inch Headliner Materials that can be used to replace your existing light Grey Headliner Material which are reasonably priced per yard and proven in the Automotive Industry, not cheap imitation after market materials, these Materials are designed for Mercedes Cars and SUV’s.
If you do have a shop install a replacement material make sure the Material is only the 1/8th inch in thickness Material as Original, most shops install 1/4inch which is designed for American cars because most shops don’t work on Mercedes so they use what they have in stock.
If I can help answer any Questions feel free to ask. Bill



