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A mount that 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 Honda Kawasaki Suzuki and 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 # 10991Top MeasurementStandard 2.25 x 3" (with four sets of mounting holes to allow leftright and center mounting options.Mount StyleStem Mount 13mmShaft Length3.5"Shaft StylePivotHeight4.25" / 1.0" (from stem nut)