Do you need the adapter?
I have a few Radeon cards, and they all have multiple pins, but a regular S-video cable works for the video...I think the rest are for video-in, etc. One of my cards came with a cable that was S-video (looking) on one end, and the other had S-video in, RCA in, and I think RCA out, but the thing worked fine with a regular S-video cable...