on the engine, there are two . . . left & right . . . same part number.

On the tranny . . . there is one, and the rear, there may be two!!! The engine one is different than the tranny or rear mounts.

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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