I've got a replacement piece of mirror glass for the passenger side on a 2015. Mine had a tiny crack that I figured would eventually get bigger so got a replacement ahead of time. Then I ended up trading it in before I ever got around to repacing it. It's just sitting on the shelf taking up space. PM me an address and I'll send it.
If you want to really clean the Trans you need to exchange the fluid 3 times and that will get all the fluid. I have done lots of towing with mine and the cooler on the trans holds the fluid temp fine.