Looking for thoughts on roof rack accessories

Looking for thoughts on roof rack accessories roof rack t slot accessories T-slot hardware kit fits most aftermarket aero style roof racks & aluminum truck racks with top side T-slots; Includes a custom hex, and open end wrench for roof rack t slot accessories roof racksaccessories ) Both OVS and RSI, and various other vendors, have very little information on their websites about these roof

roof rack t slot accessories T Slot Bolts for Thule, Yakima Roof Rack Cross Bars, Platform, Cargo Basket, Stainless M6 M8 x 30mm35mm65mm Square T Track Bolt Adapter

how to make a slot machine hit Premium-Fit Prorack Prorack T-Bolt RoofBox Fitting Kit $35 Add to cart Quick Features and Benefits Allows fitting for a range of products – will allow fitment of accessories from most other roof rack manufacturers; Standard T-Slot