I swapped mine from my original 16 inch steel wheels to a set of 17 inch rubicon wheels. Worked fine. No kit needed.
The tire dealers have been taught that most tpms sensors need a kit on changing from one wheel to another because the cap that holds the stem is destroyed on many tpms sensors when they are swapped.
The jeep stock sensors do not have this problem.
You can also have your local tire dealer sell you a set, they do not have to be the jeep brand to work as the technology is purposefully generic. I have seen prices from 15 each to 40 each depending on who is quoting. I think the jeep sensors are about 33 each from jeep.