With the original mirror control knob and a reproduction deluxe door panel, there isn't enough thread coming through the panel to screw on the bezel nut unless some of the door panel backing is removed...(at least the pressed board backing), and then it will barely catch the first thread, but enough to screw it on. The threaded portion of the control knob is only about 3/8". Any way, that's with a reproduction door panel, maybe an original one is constructed differently or altered at the factory during installation.