8pcs M157 Engine Pistons Rings for M157 5.5L engines with OEM numbers A1570300117, 2780301317, 1570300517, and 1570300317.These piston rings are designed to meet the specifications of M157 5.5L engine applications, proper fit and function.Made from materials, the rings support engine performance under normal operating conditions, including temperatures up to 105℃.Suitable for use in vehicles equipped with the M157 engine platform, these replacement piston rings provide consistent sealing and structural integrity.The set includes 8 pieces and is intended for direct installation as part of engine maintenance or rebuild procedures. This is an independent replacement component.References to brands or models are solely for compatibility indication.