Just wanted to say thank you Phil for your awesome harnesses and super quick responses to questions! The upgrade to factory GM tow mirrors was seamless thanks to you!!!
That said, if anyone is looking to upgrade from DL8 to DL3, I have a pair of factory DL3 mirrors from my 2014 Sierra SLT All-Terrain that I'm selling. They are black/chrome with power folding, led turn signal, puddle lamps, and heated. Looking to get $400. PM me if interested. I have more photos, but am limited on size to upload on the post.