For FX, FXST rear 1981-1991, FXR 1982-1991 right side, 11 1/2 inch. Machined from 420 stainless steel plate, these brake discs are heat treated for strength, wear resistance and hardness. Precision ground for trueness, these discs are drilled to reduce weight and provide cooling while reducing brake fade under extreme conditions. These discs have a unique style, increased friction coefficiency and excellent wear characteristics. For complete hardware kit, order part #E5986 (flat head allen).