Try contacting the MB Classic Center in California. They might be able to explain the options and feasibility of obtaining a reman from Stuttgart. If you choose that route, you'd likely order it through them.

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-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired