Left.4 PISTON CALIPER. Right.4 PISTON CALIPER. W/O Z51 PACKAGE. 4 Piston Caliper. A clip which snap onto the steering knuckle abutment or Brake Caliper Bracket, used to provide a smooth channel for Disc Brake pads to ride in and to reduce viBration and rattling. A Pin used to hold / lock the Disc Brake pad in place in a Disc Brake Caliper. Brembo Front Brakes. Disc Brake Caliper Hardware Kit. Exc.For Red Painted Caliper. Exc.Heavy Duty Brakes. Exc.Performance Package. Incl.Disc Brake Anti-Rattle Clip. Incl.Disc Brake Pad Pin. Performance Brakes. Abutment Clip. Anti - Rattle Clip. Caliper Hardware. pads retainer. Spring.