I did a search and I guess the B7 guys used this company for their license place LED upgrades. 42 Draft Designs They have you covered for the side markers but not the ones in the tail light.
Sylvania has a bulb size chart http://www.sylvania.com/ConsumerProd...lacementGuide/

Then just shop around looking for LED versions of whatever sizes it says you need. I guess I need the 3457 and the 7528.