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Stem Nut replacement. This mount replaces the manufacturer installed stem nut with our custom nut. Mount centers over top triple clamp. To view the Yamaha model numbers please click the link below.PART # 10998Top MeasurementStandard 2.25 x 3" (with four sets of mounting holes to allow leftright and center mounting options.Mount StyleStem Mount (replacement stem nut)Shaft Length3.5"Shaft StylePivotHeight4.25" / 1.0" (from stem nut)