Bummer, but thanks for that info! Super helpful. The star gear appear to be identical to the alternator adjustor bolt, same number of teeth, same size and shape, etc., except the alternator version sit on an M10 bolt, whereas the power steering pump version sits on an M8 bolt. A 40mm M8 bolt with the star gear would be ideal. Seems like Mercedes must have made one since they show this new pump as the correct, superseded part for the car. Without a longer bolt, it doesn't work, and I can't imagine Mercedes expects anyone to make their own bolt like I did... Or maybe they coupled it with an updated mount that uses an adjuster like yours? I'll keep digging.... thanks again.