Genuine Yamaha rear cushion (shock) that fits years and models shown. Shock is in excellent condition with only one fin slightly bent and a few others dinged. Was pulled from a running 1979 IT400F but the number shows 1980 IT250 and IT425. Nitrogen filled but may need to be reworked for your liking. Valve is in good condition with cap. Spring is painted yellow so it should be standard stiffness. Comes with pivot pin as shown. Length is 27-3/4 inches eye to eye.
Yamaha part number 3R8-22210-00-00