Actually, the picture is from a 211 chassis and the device #40 would be a shock by my definition (note both a upper and lower control arm positioning the wheel, through the spindle).
As it turns out another inferance in the term "strut" can refer to a shock that is used for load or height leveling. That is what this strut does.
Bosch Master, ASE Master, L1
33 years MB technician