Notes: 129A01-22950 RING SET, PISTON .25 is original YANMAR product. 129A01-22950 RING SET, PISTON .255 is commonly used in transmissions/axles/engines 3TNV86CT-DMW, 4TNV86CT-PTB, 4TNV86CT-MKTFK, 4TNV86CT-KKTFK, 4TNV86CHT-MAW, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849