I just performed the DL8 to DL3 mirror upgrade on my '17 LT Z71. The job took me about 1.5 hours start to finish using the harnesses I got from PGamboa. Phil has obviously done his homework as this job was absolutely plug and play. Couldn't have been easier and the harnesses look absolutely stock. Power adjust, power fold, turn signals, puddle lights, and heat all work as they should. Well done.