I bought a spare relay box because I thought mine got fried when I did the standalone fog light mod. However this was not the case and now I have an extra relay box. It is the one found behind the glove box in A4s (mine is a 99, not sure what year this works up to).

Part number on the front is: 8D0 907 701 B

It is fully working and I can provide a pic if needed.

Looking to sell it for what I paid, $15 + $10 shipping = $25

Email me at Jcook12@kent.edu if you are interested as I will prob not check back to this thread.