I receive loads and loads of e-mails all year long requesting for part numbers. Therefore the most frequently asked part numbers are listed here. Which will save you a lot of time sourcing your parts and myself answering all your e-mails.
You can order them @Donkervoort to support the factory, or at your local Ford or Audi dealer of preference. Move your mouse over the image, and it will show the relevant #number + interval for replacement.