350SDL (126.135) L6-3.5L DSL Turbo (603.970) (1990)
Color codes in the center of the spring are manufacturer's control codes and have no reference to the spring length.
The part no. and Mercedes-Benz emblem are stamped on the bottom coil of each spring.
The various spring lengths (installation heights) are identified by the following colors:
red = short spring
blue = long spring
The various installation heights of the springs and the differing axle loads resulting from the different vehicle models and versions are compensated by
installing rubber mounts of different heights (see tables "Association, front springs or rear springs - rubber mounts").