Rear Drilled and Slotted Rotors & Brake Calipers + Ceramic. CHEVROLET ASTRO 2003 - 2005 All Models. 2x Both Rear Drilled & Slotted Disc Brake Rotors: S-55066. CHEVROLET SILVERADO 1500 2001 6 Lug; with Rear Single Piston Calipers; with RPO Code JC5 (Vacuum Power, 4 Wheel Disc, 7200lb).