Notes: 453812 RIGID AXLE 28.44 FR-1800 Rear POS. 17.6 is original CARRARO product. 453812 RIGID AXLE 28.44 FR-1800 Rear POS. 17.61 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849