I hate the 50¢ mirror that comes with the 2012 JK. I hate all the ghosting it has. I could see everything except what was behind me. So I replaced it. I put in an auto dimming mirror I got from autoanything.com. I got the Gentex K2 Autp-Dimming Rear View Mirror $83.95. It is awesome. I can see. I have not wired the auto part but the mirror is crystal clear. The mirror is about 1 inch wider than the factory mirror which is great because I can now see from side to side through the back window and it fits just perfect between the sun visors.

It also fit perfectly on the factory windshield wedge mount. I also added the Gentex wire cover. You need the short one for up to 3 inches. I already have my radar detector wire tucked into it.