I'll update this in case someone else has an issue in the future.
Here's the part that broke:
Friend of mine welded a piece of threaded rod on it. See how it works when I get home tonight.
Kasco did get back to me, and this setup is discontinued.
"Thank you for your email. The part you羆*e describing is our jig latch assembly. Although we have discontinued
production of the Uni-Hitch and few parts are still available, this part is one we still have in inventory.
Price is $52.50 each + S&H. If you would like to place an order, please contact us at 1-800-458-9129. Again,
thank you for your inquiry."
Not sure if its $55 for just that broken part, or for the entire assembly.