One other point, if the rear Bilsteins come with their own bumpstops, compare length to the Z4 rear stops. If they are the same I would keep them, and return all the extra stops. If they are not same length, by that I mean longer or comparable length to stock stops, use the Z4's.
Reason I ask is I had bilstein sports on my other BMW and they came with shorter rear stops. In fact I reused them when I put konis on that car. They were good quality stops (better than OEM) and had not deteriorated at all in 10+ years.
I have not seen new rear bilstein sports in person for the 335. Someone who has maybe could chime in.
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