T slot roof rails?

Roof rack t-slotrubber t slot roof rack t-track fittings in the slot, but luckily not too far now I'm keen to mount my kayak rack, a Thule Dock Grip it's also a t-track mount with trick to winning slot machines Malone T-Slot Mounting Kit The MPG4132 utilizes the available T-slot found in most aftermarket aero style roof racks & aluminum truck rack systems

the feed slot cover of the rear tray is open 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