Huge kudos to @pgamboa This weekend I upgraded my DL8 mirrors to DL3 it was rainy as hell but thanks to Phils Youtube videos and clear instructions it was a breeze. I purchased his DIY kit as I was comfortable with doing the electrical. However if you aren't, the plug and play harness is for you. The package arrived in 1 week which was very quick (shipping from Texas to Ontario Canada) Everything was neatly packed and labeled very professionally. There is a PDF on which pins you have to pin out that are colour matched to the corresponding wires included, very simple!! Only thing I did do different: included is a butt connector to tap in a new ground in, however instead I soldered and shrink wrapped the ground connections together for peace of mind. (The butt connection works flawless don't get me wrong, but I guess I'm old school)
I picked up my new mirrors from a local guy selling his DL3 mirrors that never saw the road, they were pulled off at the dealership being they installed towing mirrors before he picked up his brand new truck. They were collecting dust in his garage so I picked them up for $200 cash. Couldn't turn that offer down.
I swapped off the chrome caps from the DL3 mirrors and put my black ones on (Phil has a easy video on YouTube explaining how to do so without snapping any clips) and began the swap.
It's is funny because my dealer said this couldn't be done/or spend a fortune. My last vehicle was an 07' Chev Trailblazer it had the turn signal built into the mirror and if you didn't have that option it was plug in play no matter what trim you had, not the case for these trucks. (Phil made this possible though)
Anyways HA GM dealer I spent $260 and a Saturday afternoon all said and done... I couldn't be happier... My 17' Elevation SLE is unique now in my area with it's power folding, T signal, and puddle lamps.
Thanks again Phil, your knowledge and professionalism is greatly appreciated. Don't hesitate order up folks!!