Leather
W220 interior can be made from different colors of leather. The color used for leather can be found from option codes listed in data card.
Leather can be bought from these merchants:
- https://www.lederzentrum.de/farbmuster.html?herstellerid=7
- https://www.colourlock.com/mercedes_leather_dye_colour_chart.html
Seat covers
Lseat.com offers Mercedes S-Class custom real leather front seat covers for around 350 USD:
- https://www.lseat.com/products/1999-2005-mercedes-s-class-custom-real-leather-seat-covers-front.html
For $2.50 Lseat.com will send a nice card with swatches of all their colors.