Ma's Mirror adapters are a small alum turning that is made in two diameters one (about 1/2" long) fits inside the hole left in your mounting point on the controls (be sure to pull out that little spring clip thingy) the other dia is slightly larger and sits ontop ot the control the entire thing is about an inch or so long...then there is a hole drilled thru the entire thing for the use of any HD type mirror...they work very slick and for the $17.00 they cost sure beats messing around with other spacers and such!