Notes: VOE11716543 BEAM RI 28.44FR-1800 (370646) L1366.5 is original VOLVO product. VOE11716543 BEAM RI 28.44FR-1800 (370646) L1366.51 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849