There's been some debate as to whether the engine shocks are useful/needed, and the answer I liked most was "Mercedes wouldn't have put them on the engine if they didn't think they were needed".

The new height shouldn't matter to the shocks. The new height will be the correct height. You should examine the rubber parts of the shock when you take it apart and see if they are shot. I think you can buy the new rubbers. Also be sure that the shock has some good resistance when you push on the rod. The entire shock can be replaced but if I recall they are pretty expensive.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"