You need to get mirrors that have ALL the wires in the White Connector. Those with only 4 wires in the white connector do not have the "memory" feature. Those with all 8 do. It only takes 2 wires from under the driver seat thru the door connector into the door and into a connector in the door module to hook them up, these are 2 canbus wires that need to be added between then memory module under the drivers seat that go to the door module in the drivers door. After that Alfa can be used to enable everything. As others have said most of the black mirrors do not have memory and a lot of the chrome ones do. But there are black ones out there that do have memory, they are just really hard to find. Craiglist/Kijiji are the best place to find them. Lot's of guys remove them and put in tow mirrors and decide to sell their older ones a couple of years later. I managed to find a perfect set of chrome ones from a 2016 that were on the truck for just a few months, without a scratch and look like new for $220 CDN. So deals can be found.