As info, I'm getting ready to do this swap in a week or so on my 2013 st Diesel 2500. I was able to get all the pins per deereguy's post and ordered from mouser, will make my own harness and program per this thread.
The rears, I just ordered the harnesses for my year truck. As info for anyone who is looking for thiers, you're looking sales code [LB2] for interior illumination. I believe the only other harnesses are the base, and then the keyless go, which i'm also retrofitting, but since I already have the pins I'm just gonna do that myself so I knnow I'm hitting the right pins on the other side.
Thanks for everyones input. Was able to get a whole set, albeit a ding here or there, for 475 shipped from a junkyard. Lot's of patience involved in looking for limited door panels. But should be a nice upgrade.