Kit Includes: 1X Rear Disc Brake Caliper - Driver Side - 18B4854 2X Rear Drilled &Amp; Slotted Brake Rotors - S-55066 Fitment: Replacement For 2003 Chevrolet Silverado 1500 (With Rpo Code Jc3(Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2004 Chevrolet Silverado 1500 (With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Rpo Code Jc3 (Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2005 Chevrolet Silverado 1500 (Rwd-Excluding Limited Slip Differential Or 4Wd ; With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Rpo Code Jc3 (Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2006 Chevrolet Silverado 1500 (With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2003 Gmc Sierra 1500 (With Rpo Code Jc3(Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers; Without Limited Slip Differential) Replacement For 2004 Gmc Sierra 1500 (5.3L; Standard Cab Pickup; Extended Cab Pickup; W/O Limited Slip Differential; With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Rpo Code Jc3 (Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2004 Gmc Sierra 1500 (4.8L, 4.3L; Standard Cab Pickup; Extended Cab Pickup; With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Rpo Code Jc3 (Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2005 Gmc Sierra 1500 (5.3L, 4.8L; Without Limited Slip Differential; With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Rpo Code Jc3 (Vacuum Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers) Replacement For 2006 Gmc Sierra 1500 (With Rpo Code Jh1 (Hydraulic Power, 4 Wheel Disc, 6400Lb); With Single Piston Rear Calipers)