Our Goodboy Racks require a base rack to mount to. We have chosen Thule. Thule is the worlds largest and fits more vehicles than any other. We stock most components, but can usually get next day for Fit Kits, and anything else Thule offers. Please contact me with your vehicle make, model, year and existing roof (Full rack, Raised side rails, Bare roof etc). I can bundle up savings for you. Take a look at all Thule offers at Thule.com