Mercedes-Benz W204 strut/linkage between front axle (anti-roll-bar) and niveau-sensor, connects via ball joints.

Part of the whole sensor assembly
(A2045041917, front left, w/o 4-matic)
and can't be purchased alone.

Measurements taken from original part out of a 2011 S204 C200 (Xenon-headlights) in mm.

Eye to eye distance = 174mm
Ball joint diameter = 10mm

Not tested, so please report your experience.

Best regards,
Bernd's Custom 3D's