First, does anyone know of a reason why the 2015 Trail Ridge tow mirrors wouldn’t fit on a 2017? I was under the impression they were all the same body style for quite some time. Second, is the wiring harness that goes to the mirrors universal? For instance , my 2017 XLT doesn’t have blinker, nor blind spot monitoring, if I bought the more advanced mirror that includes one or both features, is it simply plug and play? Thanks!