Now that you have dry fitted and before you do the final bolt-up, sand the underside with a 220 or so grit paper, use "Prepsol" or similiar to remove grease, apply a spray primer of some kind and paint the under side of the visor a flat black in color. Do that because at night, if the underside is white or a light color, it will reflect light from the front running lights into your eyes...a very distracting issue when driving at night. Not wanting to take the ceiling down to put large washers on the inside, I used "wing" bolts that flair out when pushed thru the hole from the outside, then expand like a wing on the inside. Between that and the 3M 5200, the visor hasn't moved at all since I did that. JWIT