RACEORLY Pistons Rings Set STD 84.5mm For A6 A8 3.2 FSI 2006-2009 BKH BPK STD specification (no cylinder bore expansion required) Cylinder bore diameter: 84.5 mm Piston diameter: 84.31 mm Piston pin diameter: 20 mm, length: 48 mm Ring thicknesses: 1.2 mm, 1.5 mm, 2.0 mm Includes 6 piston and ring assemblies Compatible with OE numbers: 06E107065F, 06E107065AC, 06E107065AQ, 06E107066AQ, 06E107065M, 06E107065F Compatible with engine codes: BKH, BPK Fits A6 4F2 (2007–2008), A8 4E8 (2006–2009), A6L (2006–2008), AUK