Notes: 138830 SYNCHRONIZER ASSEMBLY 506 D90 REV.FRW. is original CARRARO product. 138830 SYNCHRONIZER ASSEMBLY 506 D90 REV.FRW.4 is commonly used in transmissions/axles/engines 134998, 137394, 137394, 134998, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849