Wow this is a lot of information.
Seems like not many people have done this with 2017s yet, but I imagine it's not much different.
I just picked up a 2017 Denali 1500 with code DL3. Would like to upgrade to tow mirrors, but keep all functionality.
Looks like up to date part numbers for the mirrors are.... is this correct?
Left 84041609
Right 84041611
Also, do I know for sure what harness I will need by just knowing the year and model? Or do I need to pull it apart to see what is needed?