The dash switch part # I used was 23180146.
I don't know if you need this or not. I couldn't get mine to work until I installed then they worked no problem. The switch part number 23180146 however is a fully loaded switch. It has traction control hill braking cargo/bed lights, pedal mover, parking sensors, and lane keep, and the bars. I don't know if there is an option with ones that only you maybe looking for with an LT vs LTZ which I have.
The nut/nutsert are available at autozone I believe 8mm but could be wrong.
On the harness I made my own following phils diagrams wasn't the easiest wiring job I have every done but it is doable.