Ok. So I had a chance to purchase everything that should have been needed for the mirror upgrade. Mirrors, switch, and new harnesses. The fact is, 2014 and up Silverado LT's are not wired for this upgrade. If you want OEM look and feel, which is what I like, you either have to have your vehicle main harness and fusebox swapped out (which ain't gonna happen), or wire everything yourself manually if you can figure out the wiring scheme of the mirrors, then hope you can hide all the wires added. I have the parts to make it work, just not the time. Power fold wiring is only included on the LTZ's and up. They have different body harness and different fusebox. I actually replaced the fusebox in my LT. Quick job, but hard to find the right parts. GMPartsGiant.com helped, along with another site I cannot recall right now. I have the most options on my LT, and still does not allow the upgrade. This includes many electrical upgrades, like the front collision detection. So if you have an LT, make time to experiment and wite yourself, or be content with the truck you have.
PS: I am looking to sell my upgrade items to anyone interested. Mirrors are on ebay, but I also have driver switch, button harness, and door harness.