Cargo box mounted on flush aero bars using T-slot bolts

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Or does the rack with the T-slot adapters fitted then slide into the T-slot bar? I am a bit confused Bars: Thule Wingedge Rack: Yakima HighRoad T-slot adapter

roof rack t slot accessories 10 Series, 1″ x 2″ SMOOTH T-Slotted Aluminum Extrusion, TNUTZ Part #EX-1020, 51″ long with 14-20 tapped at both ends These are 100% equivalent and compatible

indo777 slot T-Slot Rubber Beading by Front Runner This rubber beading fits into your Front Runner Roof Rack t-slots to create a perfect rattle free and non-slip