Notes: 129004-22900 PISTON W/RING OS=.25 is original JOHN-DEERE product. 129004-22900 PISTON W/RING OS=.255 is commonly used in transmissions/axles/engines 3TNV84-GDG, 4TNV84-DMW, 4TNV84-GGE, 4TNV84-KVA, 4TNV84-KWA, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849