AC34-N12 N16 Engine Piston & Ring Kit 77mm STD Set For R55 R56 R57 R58 Cooper Countryman Paceman 2006-2016 11257589348 Material: metal Size: standard 77mm bore Fitment: compatible with R55 R56 R57 R58 R59 R60 Cooper Countryman Paceman models Engine Codes: N12 N16 Year Range: 2006–2016 Contents: 4x piston and ring set This piston and ring kit is designed for use with N12 and N16 engines in select models from 2006 to 2016.The 77mm standard bore size ensures proper fitment for engine rebuilds requiring OEM specifications.Each kit includes four pistons and corresponding rings, suitable for full engine reconditioning.The components are constructed from metal materials capable of handling normal engine operating temperatures and pressures. Compatibility covers a range of applications including R55 R56 R57 R58 R59 R60 platforms equipped with N12 or N16 engines.Matching part numbers 11257589348 and 11257576975 direct replacement functionality.The design focuses on dimensional accuracy and mechanical for consistent engine performance after installation.This set supports restoration of engine compression and efficiency when used in properly prepared cylinder bores. This is a compatible aftermarket part.References to brands or models do not imply OEM association.