This may not be what you're looking for, but there is an w124 with a manual tranny at Pull-a-Part Cleveland. Odo shows only 136k. Could be a pretty nifty solution.

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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