Notes: RI-660862 STUD R18X2.5 - D18X1.5 - L82.5 - 10.9 is original CARRARO product. RI-660862 STUD R18X2.5 - D18X1.5 - L82.5 - 10.91 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849