I am supposing that the Europeans like chicken lips more than us Americans. Is it correct that there were more 300d manual transmissions over there? If so, the European parts supplier I posted should be able to get a new one. Alternatively, a European salvage yard may have one. You may even be able to find one out of one of the light commerical vans that used the 617 engine. When I do the search on that site and click on 'flywheel', it shows a part but it names it 'ring gear' so I suspect it may not be a manual flywheel.

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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