The new SSR GT10's look a little like the Z06 wheels. They look awesome on H&R's 05 Mustang.
http://www.seriouswheels.com/2005/2005-Ford-Mustang-GT-Coupe-HR-Special-Springs-FA-1600x1200.htm
http://www.tirerack.com/upgrade_garage/BigPic.jsp
Not sure if they make them for 04's though.
http://www.seriouswheels.com/2005/2005-Ford-Mustang-GT-Coupe-HR-Special-Springs-FA-1600x1200.htm
http://www.tirerack.com/upgrade_garage/BigPic.jsp
Not sure if they make them for 04's though.