Specification: Bracket: with Inlet Port Size: M10x1.5 OD Piston Size: 37.9222 mm Piston Size:1.493 in Brake Piston Count: 1 Piston Piston Material: Metal Bleeder Port Size: M10x1.5 Compatibility: Replacement for Buick LeSabre 2000-2005 All Engine Replacement for Buick Park Avenue 2000-2005 All Engine Replacement for Oldsmobile Aurora 2001-2002 V6 3.5L Replacement for Oldsmobile Aurora 2001-2003 V8 4.0L Replacement for Pontiac 2000-2005 V6 3.8L Replacement Part Number: 18-B4718B, 18-B4719B, 18B4718B, 18B4719B, 141112, 18042413, 89047652, 89047651, 18042414 Features: High quality materials enable it to last for a long enough time, precision machining reduces wheel swing or vibration during braking, and improves high-speed driving stability Package Includes: 1 x Rear Disc Brake Caliper-L 1 x Rear Disc Brake Caliper-R