5311. Left.DUAL REAR WHEELS. Right.DUAL REAR WHEELS. Rotor bolt. A Bolt used to mount / lock the Disc Brake Caliper to the Disc Brake Caliper guide pin. Disc Brake Caliper Bolt. Disc Brake Caliper Bracket Mounting Bolt. Disc Brake Rotor Set Screw. CLPR. Bracket Mounting. Guide Pin. Rotor Set Screw. Slide Pin.