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BMW Mirror mounts fit into the unused mirror holes left or right side. To view the BMW model numbers please click the link below.PART # 21004Top MeasurementStandard 2.25 x 3" (with three mounting holes to allow leftright and center mounting options). Also has 1/4" hole for thumb screw.Mount StyleBMW Mirror MountShaft Length3.5"Shaft StyleBallHeight4.25" / 1.0" from Handlebar