I would like to know as well... I want to get rid of the amber. When I used to have my Porsche there was a place I went online to get all my chromed bulbs but I can't find the website to save my life. Maybe I'll check my old e-mail. They had VW and Porsche stuff though, and basically any bulb you wanted to change.
You know the size of the bulb?
Also what about the DRL bulbs? I was planning to install the LED turn signals from achtuning and route them to my existing DRLs, but I'd also like to put in a nicer more white / hid or LED bulb in the exisiting DRLs to match the HIDs. (2010 VR6 4motion btw).