You should be OK with new springs. I would suggest you buy OEM from Mercedes Benz. Replace all four springs and go with the Bilstien of Boge shocks/struts. The new springs will stop you from regularly bottoming out.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T