Notes: 22123 HEXAGON NUT UNI 5589 M12 is original CARRARO product. 22123 HEXAGON NUT UNI 5589 M125 is commonly used in transmissions/axles/engines 129144, 129691, 134297, 134630, 134998, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849