It's a motorhome. 617 5 cyl diesel with a 5 spd. A couple of parts dealers in the US. Eurotech out in your neck of the woods. Can order parts directly from Europarts in the UK. Some engine parts are interchangeable with the 300d engine.
The 409's are quite rare. There are more 207's, 307's and 407's. These have the 616 4 cyl diesel. (same as 240d)
4's have the dual rear wheels. 2's and 3's have single rear wheels.
I like the van. I probably would not consider a 4cyl or a 4 spd in the US. In Europe, driving conditions are different, so I would buy one over there again.

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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