Stumbled across this earlier. You can pick your colour Zed and try different style wheels.
https://www.tirerack.com/wheels/results.jsp?autoMake=BMW&autoModel=Z4+3.0si+Coupe&autoYear=2007&autoModClar=
Lists other cars too (Z4 roadster etc, but couldn’t get it to accept a UK postcode, so you may want to invent a US one to try it out if you don't have a coupe.
https://www.tirerack.com/wheels/results.jsp?autoMake=BMW&autoModel=Z4+3.0si+Coupe&autoYear=2007&autoModClar=
Lists other cars too (Z4 roadster etc, but couldn’t get it to accept a UK postcode, so you may want to invent a US one to try it out if you don't have a coupe.