With the Dynamic Rear indicators or front indicators you'll need the modules which attach to the light units, they are not cheap and you need to make sure your LED rear lights are capable to have Dynamic lights activated. There's a company that deals with them www.adcanced-incar.co.uk they sell a lot of retrofit parts for European cars.
As we are probably all aware barn/field finds are hot topics right now in the car world. Here's a selection of pictures of abandoned Audi's from Google images.
Enjoy! :)