If your looking for a lead on euro parts this fellow may be able to help you
ryanparkin1@googlemail.com, Barnsley, South Yorkshire, UK
Over on TDIClub he is one of the leading supplier of euro VW diesel bits for us US TDI junkies. I don't know if he is interested in sourcing MB stuff or not but he has an established relationship with many breakers in the UK, is an ace at the shipping/tracking process, and is an all around stand up guy. If nothing else he may be able to point you toward someone who specializes in MB stuff.
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'00 Golf TDI- 175k, more mods=+++mpg

'02 Honda Odyssey- 164k on original trans, knock on wood every time we drive it
88' GMC SLX 4x4- 182k
'80 Kubota B7100
'55 Ford 650