S9 Kits Yellowstuff and USR Rotors. S9 Kits Yellowstuff and USR Rotors; Rear; FMSI Pad No. D340; Solid; 5 Bolt Holes; 255mm Dia.; 48mm Height; 10mm Thick; 68mm Center Hole Dia.;. USR Fine Slotted Sport Rotors.