You'll have a better chance of finding one if you repost on the Lighting forum.
I prefer using the AS-19 stands that come with the sb600/800. I can send you one of the aluminum ones that came with my umbrella brackets, but you'll need to tape it, and it doesn't provide a very good grip. I know because my strobe fell out of it and hit the ground. Fortunately the ground was covered by soft grass, or I'd be out $350.