I have the same setup I'm going to be using. The front spring rate seems to be pretty close to what we need for the E30.. The rear however, is quite stiff from the Z3MC.
Hello. I’m doing the same thing for the front. My trouble is getting the top mount of the e30 onto the Z3M strut. How did you fit the socket and nut on there? Mine was a 21mm, did you use a thin walled socket?