Sliderule

I have a 2015 3500HD Denali w/ 6.6 diesel. I read your feed on the mirror upgrade but still not quite sure. It came with the standard dual function tow mirrors, Heated and Turn signal. Based on what I read, what do I need to upgrade to the mirrors put on the 2015.5 models and have full functionality. heated, turn, power folding, puddle lamps etc. Basically what exact tow mirror do I need and what harness to go along with it. If I would have know the 2015.5 was going to have these type mirrors I would have waited to buy my truck