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Before pulling the trigger, I'd try to get your hands on a rotor and with a caliper measure the height of the outside of the mounting hat that would mount to the wheel hub to the brake material surface...
Issue with the Z4m is that it has very shallow hats whereas the E90 M cars have deeper hats so if it's much deeper...the rotor will hit the dust shield at best or at worst hit the tie rod that sits just outside the dust shield before it sits flush on the hub because of the deeper hats.
I came across this all while trying to adapt a set of F80 calipers/rotors to my Z4M...it does not work for this exact reason so double check to see if the E90 will mount without touching the dust shield/tie rod
Cheers.
What may work is the calipers on the stock rotors...with a proper caliper adapter...it's those damn rotor hats that this car was designed with that pretty much does not allow a BMW brake swap from other cars...why pretty much one has to go BREMBO or StopTech BBK...
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