Notes: 136658 STUD BOLT M18x1.5x50 is original CARRARO product. 136658 STUD BOLT M18x1.5x505 is commonly used in transmissions/axles/engines 137784, 147770, 148121, 357530, 357531, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849