The Twistboxes Mounting Kit is the universal hardware set that fastens a Twistboxes Gen3 roof box to virtually any roof rack. It includes both T-bolt and U-bolt fittings plus the matching brackets, washers and nuts, so it works whether your crossbars have a T-slot or not.

Every rental already ships with a mounting kit included, but a spare or replacement set is handy if hardware goes missing between rentals or if you're outfitting a second vehicle for the same trip.