I am not sure exactly which boards our referring to as I have seen a couple of different types on the 12s. These are the boards that came on my 2012 Laramie. I am pretty sure you could go to your dealer and inquire about pricing and such (and then go home and get them online cheaper
As far as holding up.. mine have shown no wear at all in the six months I've owned the truck. They still polish up real nice (when I feel like going into that much detail). I love 'em!
Good luck to ya!