The Kubota 1490121050 Piston Ring Set STD is a genuine OEM component designed for standard bore Kubota D902, D1005, D1105, V1305, and V1505 engines. This standard size piston ring set ensures optimal engine compression and performance, fitting a wide range of Kubota tractors, excavators, loaders, utility vehicles, and mowers including B2320, BX23S, L2501, KX033-4, SVL65-2, RTV-X1100C, and F2690 models. Manufactured to Kubota's precise specifications, it provides reliable sealing and durability for critical engine operations.