Notes: 24311-000240 O-RING, 1AP24.0 is original YANMAR product. 24311-000240 O-RING, 1AP24.05 is commonly used in transmissions/axles/engines 4TNE84-AF, 4TNE84-BME, 4TNE84-EAF, 4TNE84-EKRV, 4TNE88-ELAN, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849