Add the SmarT-Slot™ Kit 6 to the SkyBox NX, GrandTour, and CBX Cargo Boxes for an even sleeker profile on T-Slot Crossbars. This easy-to-use hardware kit replaces the standard mounting hardware, and directly attaches to a T-slot channel on your crossbars. It works with all Yakima® T-slot crossbars as well as most other T-slot crossbars.