The year after my truck comes with them...I want them. What parts (other than new seats) would I need for the complete install?

 

i'm just spitballing here but you'll need controllers and any related interior panels such as switch covers (please don't cut up the factory ones) and you'll probably need some sort of wiring kit to go to the fuse box. you'll also need the heating and cooling elements for the seat if the new seat doesn't already have them.