stock HID bulbs are 4350K - I matched up my parking lights and H9 high beams....
Fog lights (H11) work best if they are 3000K
If you do HID fogs then get the digital ballast.
The listing you linked has no ballast
See this for reference
http://cgi.ebay.ca/HID-Xenon-kit-H3-...QQcmdZViewItem