S9 Kits Yellowstuff and USR Rotors. S9 Kits Yellowstuff and USR Rotors; Rear; FMSI Pad No. D1180; Solid; 4 Bolt Holes; 280mm Dia.; 36mm Height; 10mm Thick; 55mm Center Hole Dia.;. USR Fine Slotted Sport Rotors.