Contact MB I am sure they are still available. In 2000 when I bought a 1980 300SD, I was able to get a "reproduction" owner's manual for it through a dealer. It only cost $16.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member