Does Audi roof crossbars have the T-Slot?

Low Cost 8020 crossbar DIY roof rack t slot BougeRV T-Slot Kayak Roof Rack Saddles, Only Fits for Auto Cross Bars with T-Track to Carrier Kayak Paddle Board Surfboard with Tie Down Straps Ratchet Strap, roof rack t slot accessories An example of a roof rack for a 4 wheel drive built using T-Slot extruded Aluminium profiles

24 slot 3 phase motor winding diagram I made a dozen roof rail brackets from 1 stainless bar stock and 14-20 machine screws tapped and welded Also hinged one side of the panel