The Rock Krawler JT box kit entry for 2019 and newer Jeep Wrangler JT identified as 4.5in PX-COMP describes a Pro-X competition-style 4.5-inch long arm component set for JT applications. These kit components are intended to fit 2019+ JT Wrangler models and correspond to the PX-COMP kit designation, providing the suspension parts associated with that configuration.
Rock Krawler 2019+ Jeep Wrangler JT Box Kit JT 4.5in PX-COMP