UPDATE
What’s up CT team? So got around to finally trying to swap my base mirrors on my LT to ones with built in turn signal.. however they are NOT plug and play

connector on new mirror has 2 extra pins/wires for a total of 7 pins while the harness on my car only has 5 wires/pins.. Motor works when new on is connected but turn signals obviously don’t. I undid a bit of the loom to see if there are any extra wires but no luck, looks like it’ll take some more work to get the signals to work. I guess higher trims already have the necessary connections. Hopefully all that makes sense and photos too. For now I’ll stick with my regular mirrors and wait for warmer weather to probably just run some wiring from the headlight to the mirror.
So if you havea 2016.5 LT swapping mirror with turn signals will not work sadly without some extra work.
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hahaha I remember you did and believe me I went in with low expectations but with a small bit of hope it’d be as simple as plug and play and call it a day! I mean it’s not a total loss of $200 yet, I already ran wiring for my aftermarket fog lights through the fender and into the door where i placed the switch right under the trunk release button so will just loom it all up the next time it’s warm out because the new mirrors do look sleek and added safety of switching lanes is cool too haha. Plan B was just cutting some holes in the fenders and use some beamer or honda side markers but don’t think it’d look as clean as the mirrors.
One thing that does bother me most is putting the **** door panel back on 😂gm did not make it easy to do in a few minutes.
i will update you when I get around to wiring them up in the coming weeks/spring break. Appreciate the help and tips Mav!