This kit is to get the cargo lights operational when upgrading to towing mirrors on 2019-2021 Silverado and Sierra 1500 trucks. This harness is only required for those who did not originally have bed illumination (RPO code UF2). In addition to this kit, you will also need the modify door harness kit (all vehicles) and the RZY harness (2019 ONLY)
Link to installation video: https://youtu.be/R4YbK1nb_UI
Fits 2019 2020 2021 1500 Silverado and Sierra 1500.