My wife needs her 03 C320 4matic lowered, but I'm not having much luck. I bought some Tein S-Tech SKG00 and they wouldn't fit. Then I bought some SKJ26 S-Techs...same problem. I never got around the rear spring, but the factory fronts taper on each end to fit the strut...the Tein's are the same dia. all the way. The springs are piling up so I'd really like to get a set that fit! Not looking for performance as much as ride, so something progressive. I would rather not spend for coilovers.

 

Springs for 4matic are different.
Try Vogtland. They make springs for your vehicle.