You can find them on ebay. I want one myself, except my car will be opposite of yours, my car is silver.
i bought my car without a WS6 badge, so I bought a regular one off of ebay, the very next day a black one came up for sale. I was SO pissed!
'02 WS6 M6-ASC #2803 DOB 9/5/01
364rwhp 371 rwtq bolt-on only
Currently engineless and collecting dust
'08 Black on Black CTS - DD