Notes: 129007-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 129007-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 3TNV84T-BKSA, 3TNV84T-BKSAT, 3TNV84T-BGKL, 3TNV84T-BGKLF, 3TNV84T-BGGEC, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849