DLH,
Just being doing some research on the B12 kit for the Z4M. Not much out there, but found this post. Looking at your signature you went ahead with fitting this kit.
I already run Eibachs on my ///M, but my shocks are now on 62k so need replacing. How are you finding the ride quality and handling?
I can get the kit from Germany for approx £540, sell the springs for £150 and you're looking at a cheap upgrade... just want to check it is an upgrade
http://www.mk-fahrwerkstechnik.de/BILSTEIN-B12-Pro-Kit-Sportfahrwerk-fuer-BMW-Z4-E85-M-32-46-000033
Also, what rear top mounts did you go for? OEM bushes or Rogue kit?
G