I agree, the connector & hose looks like the self-levelling hoses in our wagon and 500E.

HOWEVER, it could also be ASD. Check your rear suspension.

If you have struts that have a hose/pipe going to them, then you have self-levelling.

If you have hose/pipe going to the differential, I believe that's ASD.

:-) neil
1988 360TE AMG
1993 500E