Based on what I've read here, your car doesn't have the self-levelling shocks. I could be wrong, but thought I'd throw it out to you. There are many "kits" available to lower vehicles.
Search function will probably turn up many hits.

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1992 500SEL 25K
1995 E320 40K
1995 SL600 120K
2002 JX8 Sport 43K
2005 Volvo S40 95K
2006 Isuzu NPR 304K (Frankencamper)
2007 Crown Victoria 150K
2014 Smart Electric 20K