4pc Car Engine Piston & Rings Kit 12578324 12578326 12621251 12659419 89018112 for - Captiva Cobalt Equinox HHR Impala 2.4L This piston and rings kit is designed for use in a variety of vehicles including Captiva, Cobalt, Equinox, HHR, and Impala with 2.4L engines.It includes four pistons and a complete set of rings per piston: one compression ring, one second ring, and one oil ring.The cylinder bore diameter is 88 mm, with ring dimensions of 88 x 1.20 mm for the first ring, 88 x 1.50 mm for the second ring, and 88 x 2.50 mm for the oil ring. The kit supports multiple interchange part numbers such as 12578324, 12578326, 12593744, 12593745, 12603910, 12608531, 12609858, 12616970, 12621251, 12631102, 12631103, 12631967, 12643172, 12646457, 12657184, 12659419, 12665165, 12784490, 19180835, 19180836, and 89018112, allowing compatibility across various engine applications. The components are constructed to meet specifications, proper fit and function during engine reassembly.Designed as a direct replacement, this kit enables straightforward installation without the need for special tools or modifications.It is suitable for engine rebuilds where performance and consistent sealing are required. This replacement is made by an independent supplier.All brand references are used solely to indicate compatibility.