Your CAT V330B has been reliable, and since you've identified the required torque converter (Part No. 6Y5200), that's a strong start. If your local CAT dealer can't source it, consider contacting suppliers who deal in heavy machinery components or used equipment parts...who specialize in sourcing parts for heavy machines like forklifts and used motor grader units and help locate a genuine or rebuilt torque converter for you. Try usedmotorgrader dot com