@the bruce: I've googled for rs3 air vents and I did not find any useful results. Do you have a link to get inspired from? With some pictures, instructions or at least some parts codes to get quoted from the dealer.
The air vent is not what I expected but maybe it's not a looker and it does a good job
It does.
TT-RS / RS3 vent:vent: 8P0 863 149 A and 150A: 15,77€/each
dust shield: 8J0 615 311 E and 312E 23,15€/each (for 370 mm rotor)
bolt: N104 222 03: 0.71€/each
nut: N 907 611 02: 0.26€/each
tube TT-RS: 8J0 864 133 A: 2,14€/each
tube RS3: 8P0 864 133: 2,80€/each (fits S3/passat arms)