Also have Eibach pro kit (xi) and cut 1" off the rear bumps from the non-progressive end. Still fits into the dust boot. I was a little worried that too much of the stiff part was being thrown away but so far so good, one winter and some pretty rough roads out here. Fronts I used e36 m3, uncut.
Funny on my e36 m3 which also has koni/eibach you have to cut off the stock OEM bumpstops. For that I got new ones and trimmed them off non progressive end as well.
OP, Would be interest to see a pic if you have the chance, comparing the Z4 rear stops to your trimmed ones. Thx.
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