Might be very helpful. DSK in BBS lingo stands for Diamond Silver with clear coat, a reasonably common paint used in the era (I found references to it in circa 2004 on wheels from other cars).Despite some of these comments, I found BBS to be easy to deal with. I contacted them about touch-up paint for the wheels and they gave me a bottle. The code on the bottle is Silver DSK 09.40.061S. Don't know how helpful this is.
Question for you, can you post a picture of the touch up paint container?