I'd search worldwide on Ebay for someone parting out the vehicle you need. But there are lots of 'breakers' in Europe that could supply you with parts. If you don't speak German, try the yards in the UK. Mercman is one used parts supplier in the UK but there are lots of others.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13