I dont think any passat owner has done it.. that I can remember.. I have seen plenty of MK5 GTIs and R32s with them. They are pretty expensive.. around 450 or so last time i checked..
You will need to buy the regular grills if you plan to remove the Fog lights.. and you Will need to modify it.. it shoud fit though.
check out tmtuning.. they have the OEM S6 LEDs.. they also have another version which is made in germany and they run around 280 bucks.
I found a cheaper set on ebay.. they run around 100 bucks and look like they are the best price for what you get. They do sell cheap ones for like 20 bucks but from my searching.. these were the best bang for the buck. I cant even find them anymore to be honest but some guy installed them and they seemed good..