Notes: 24321-000550 O-RING, 1AG55.0 is original YANMAR product. 24321-000550 O-RING, 1AG55.05 is commonly used in transmissions/axles/engines 4TNE84T-ENSW, 4TNE84T-ENSW, 4TNE84-GB2S, 4TNE84T-GB2S, 3TNE84-GB2, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849