The 2.2L engine was used in a lot of reefers during the 80s. Probably the best place to find the parts are in reefer/trailer junkyards, and if that doesn't work, pay top dollar through the trailer shops that you find off the freeways.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002