I feel your pain, main dealer doesn't stock parts for my A6 which is a similar age. I've had to resort to buying parts from eBay, even internationally. You can put the part number in the eBay search bar too and that might show results. As yours is a 1.8t it might be worth you looking for the parts under the A3 8p 1.8t or golf MK4 1.8t as the engines are the same I believe.