I replaced my shocks recently with Bilsteins on my 300D. In my case, all the necessary hardware came with the shocks. The accompanying literature was confusing, but I managed to identify both front and rear models from the sheet. It is important that the shocks are assembled according to the diagrams.

If you don't seem to have enough threaded shaft sticking out through the body, then you may need to put a second jack underneath the ball joint assembly and raise it until you can safely thread the nut. I had to do this, and I soon realized that the use of a second jack is almost imperative.

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Matt
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1995 E300 Diesel (Die Blau Frau)