4pc Car Engine Piston & Rings Kit 12578324 12578326 12621251 12659419 89018112 for - Captiva Cobalt Equinox HHR Impala 2.4L Cylinder Bore Ø: 88 mm ring: 88 x 1.20 mm Second ring: 88 x 1.50 mm Oil ring: 88 x 2.50 mm Interchange Part Numbers: 12578324, 12578326, 12593744, 12593745, 12603910, 12608531, 12609858, 12616970, 12621251, 12631102, 12631103, 12631967, 12643172, 12646457, 12657184, 12659419, 12665165, 12784490, 19180835, 19180836, 89018112 Designed for use with select and models including Captiva, Cobalt, Equinox, HHR, and Impala equipped with 2.4L engines.The kit includes four pistons and a full set of piston rings comprising , second, and oil rings.Components are sized to match an 88 mm cylinder bore, providing proper fitment and sealing characteristics.This assembly supports engine performance and compression integrity.The parts are engineered as a direct replacement for components, allowing straightforward installation without the need for special tools.Suitable for vehicle owners and technicians performing engine repairs or rebuilds. This replacement part is independently produced.All brand references are for compatibility demonstration only.