So I am currently in a very extensive annual and decided while the plane was down for a while and torn apart I might as well upgrade my Mooney from the broken plastic overhead vents to some modern eyeball vents. First idea was to order some vents from Wisconsin Aviation.  After receiving those I took them in to the AP/IA to see what he thought.  Unfortunately he had two conditions 1. They need to come from a company that made the vents for an airplane.  They fit this description. 2. I