Vortex stuff is difficult to find, it doesn't come up on ebay too often. You may still be able to get some of the kit from Audi but it's not going to be cheap. My housemate picked up a set of new Vortex grilles from Audi as his were smashed up when he bought the car. So they definitely can get Vortex parts. Could be worth calling into the parts department at your local dealership, see if they can help you out.