Lower Engine Case Screw Set - 20-Piece. This metric hardware replaces the listed fastener size and should match thread, length, head style, finish, and load location.Replace this lower engine case screw set when the original engine case hardware is rounded, rusty, missing, stretched, stripped, mixed up, or visually wrong for the restoration.Fitment / CompatibilityFits Yamaha: Yamaha TX650 (1973-74) Yamaha XS1 1970 Yamaha XS1B 1971 Yamaha XS2 1972 Yamaha XS650 (1975-81) Yamaha XS650S (1978-83) Product Details Engine case hardware Fastener material/finish: Lower Sold as a set XS650Direct part number: 49-0650 Before Ordering Confirm thread diameter, pitch, length, head style, shoulder, finish, and quantity. Start the lower engine case screw set by hand and stop if the threads do not seat cleanly.