Self levelling suspension codes
Another way to be sure if you are not too mechanically inclined, look at the production data card of your card or at the metal plaque stamped near the engine bay hood lock that has a bunch of three number codes.
If the lists includes code No. 480 (Self-levelling suspension on the rear axles) or Code No. 214 (ADS-Adaptive Damping System), your car is equipped with such a system.