For V1505 V1505-E D1105 D1305 4D78 4 Set Piston Ring Set STD 16292-21050 78mm 78*2HK+1.5+4mm Piston ring set compatible with V1505 V1505-E D1105 D1305 4D78 engines.Includes four piston rings per set.Standard size with dimensions 78mm diameter and thickness configuration of 2HK+1.5+4mm.Part number 16292-21050.Designed for replacement in engines requiring STD specification rings. Compatibility Statement: This is a third-party replacement.Brand/model references serve only as compatibility indicators.