AP01 6Pcs Piston and Ring Set designed for 325 5.9L engines manufactured between 2004 and 2006.This set includes six pistons with corresponding rings, engineered to meet specifications for proper fit and function.Components are constructed to withstand standard engine operating conditions and provide for engine rebuilds.The piston and ring assembly supports effective compression and oil control within the cylinder bore.Intended for use in compatible engine models during maintenance or restoration projects. This is an aftermarket accessory.Brand names and model numbers are referenced strictly for compatibility information.