If you've searched then I'm assuming you found this thread:
http://www.m3post.com/forums/showthread.php?t=615025
See post #7 for a picture of zcp/GTS wheels with 255/35 and 285/30 tires. Once winter is over this is the setup I plan to use and I'm hoping by then Michelin will have finally released the PSS in the rear 285/30 size.