i have the 20x9 vipers on my wk. i know its not your wk2 but here are some pics.
the specs should be posted on their site. i know there are pics here of WK2 with the srt8 reps and the vipers have the exact same specs. so they will fit the WK2.
if you have a nice hires photo of your WK on an angle that will match the wheel in my photos post it up andf I can photoshop them on it for you/
I had chrome ones in this pic/
then i had a painted set coated in black chrome