4pc set STD Piston and Rings kit with part numbers EJ7Z6108A, EJ7Z 6108 A, EJ7Z6135A, EJ7Z 6135 A, and EJ7Z6108E is designed for 2.3L engines.The piston has a diameter of 87mm and uses a 22mm piston pin.This kit follows the standard 0.00 specification, meaning no cylinder expansion, which helps maintain consistent compression and engine performance.It is compatible with 2015–2019 Focus, Mustang, and MKC models equipped with the 2.3L engine.The set includes four pistons and four matching piston ring sets, providing all necessary components for installation.The design supports under regular driving conditions and moderate performance use.Materials used meet standard emissions requirements, including no detectable content at 105℃, contributing to engine and environmental compatibility.This piston and ring kit offers a complete solution for engine rebuilding or performance restoration.