The bars are peculiar to the hitch, but in doing some Google searches I turn up very little on CP Products beyond fold up steps and dinette table posts/sockets, so I suspect the hitch is 1) rather old, and 2) someone elses hitch rebranded.
I think that type of bar is one that is supposed to have a roll pin in the "head" of it and you insert it in the hitch crossways and then rotate it into position, the pin keeping it from falling out if it loses tension.
You may end up buying a complete new weight distribution hitch assembly.
Charles