not sure where to find it, if not here, check out boats.net diagrams they are pretty good.
that said, it looks like you might be missing a keeper... or like you could add a keeper to stop it from escaping.
the other thought is,,,, did the ball wear or the socket?
Thanks for the link, F_R. It appears that will work. Also, if the socket/ball wears out they won't seperate from each other (with the washer beneath the bolt head).