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This mount has two independent movable top plates and fits the opening in the top of the steering stem. Uses an o-ring shaft that gets progressively tighter as it is installed. Mounts devices center of bike over the top triple clamp.To view the Yamaha model numbers please click the link below. Be sure to cross reference the year before placing your order. Some mounts are only for selected years.PART # 10998DTop MeasurementTwo Standard 2.25 x 3" top plates.Mount StyleStem Mount (replacement stem nut)Shaft Length3.5"Shaft StylePivotHeight4.25" / 1.0" (from stem nut)