LinQ bases with locking system for staying in the "up" position while installing LinQ accessories. Required on 2018 models and some 2019 models, to install the LinQ 13.5 Gal (51 L) Cooler (269800943) . Replaces standard LinQ bases. Standard on all vehicle with LinQ (from factory) 2020 and up. RXT, RXT-X, GTX, GTX Ltd and WAKE PRO (2018 and some 2019)