The Kubota 1290121053 genuine OEM piston ring set is designed for a 72mm bore, ensuring optimal engine performance and compression. This essential component is compatible with a wide range of Kubota D-series and V-series diesel engines, including D722, D902, D1005, D1105, V1205, V1305, and V1505. It also fits various Kubota compact tractors, utility vehicles, and mowers such as the B2320, BX1860, F2680, RTV900, and ZD21 models, providing a precise fit and reliable operation for maintaining engine integrity.