I did exact same thing on my 70 SPort Satellite . . . got complete kit from Ebay (Gentex I believe it is), that the mirror has temp, compass, homelink (for garage door opening), and auto dimming ! Works great and most people have to look twice ! I just removed the mirror stem from the mount and used the existing mount in place, for holding the sun visors. Gotta make your car for you . . . love the auto dimming and the homelink !!