That really is too bad there isn't enough interest. Potentially though, the hubs on the E46 M3 is the same as the hubs on the MZ4, so the same rotor would fit the M3. If y'all want to generate more interest, I'd start with the M3 folks first (and I've made this suggestion to RB as well).
I'm sure if you can get a set of 10 rotors (20 total) ordered they'd be happy to accommodate, regardless of whether or not it's for the MZ4.
The hell I don't! LISTEN, KID! I've been hearing that crap ever since I was at UCLA. I'm out there busting my buns every night! Tell your old man to drag Walton and Lanier up and down the court for 48 minutes!