Notes: 123901-22900 PISTON ASSY, 0.25 OS is original YANMAR product. 123901-22900 PISTON ASSY, 0.25 OS5 is commonly used in transmissions/axles/engines 4TNE106T-GE, 4TNE106T-ML, 4TNE106T-NS, 4TNE106T-TBL, 4TNE106T-G1A, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849