STD Pistons Rings Assembly Kit Φ85.5mm For A4 A5 A6 Q5 3.2L 08-12 CALA CALB 06E107065BS Car Engine Replacement Parts This piston rings assembly kit is designed for direct replacement in select models equipped with the 3.2L engine and engine codes CALA and CALB.The kit features a standard bore size with a piston diameter of Φ85.5mm and a wrist pin diameter of Φ20mm, precise fitment for engines requiring OEM specifications.Constructed from aluminum , the pistons are engineered to support efficient combustion and reduced friction, contributing to consistent compression and engine. The components are built to exacting tolerances for integration during rebuild or repair.This assembly is compatible with A4, A5, A6, and Q5 models produced between 2008 and 2012.The kit includes a full set of pistons and corresponding rings, providing all necessary parts for a complete cylinder replacement.Designed for both professional and DIY use, it offers a practical solution for restoring engine performance and extending service life. This product is a third-party replacement.Any use of brand names or model designations is purely to indicate compatibility.