Here is more info for you guys. I bought a set of Power Disk slotted rotors for the Aero from BrakeWorld last year and they were left and right directional. They didnt list rear rotors and I had ordered Xbrake rears but when the rotors arrived, I had front and rear Power Disk slotted rotors. The rears were a new item. Oddly the rear rotors still dont show up on the Brakeworld site. The Power Disk rotors work very well and are quiet.