Notes: 643331 GEAR Z23 M3.5 SLIDING/SCORREVOLE is original CARRARO product. 643331 GEAR Z23 M3.5 SLIDING/SCORREVOLE4 is commonly used in transmissions/axles/engines 643305, 643315, 643315, 643305, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849