See if any of these help you out.
As for my lock bars. The one's on our Avion lock using pins (you can see the drill holes) through the lock bars. The one's on our Airstream (which are at home in the garage) use thread steel inserts that that allow you to pinch bolt the lock bar slides at any point you desire.
I plan to install some pressed inserts in the Avion's lock bars at some point. Let's see I think this is "to Do" task 12,379 on my list of top 100 trailer repairs to be done.
Oh and the green mold is just a reminder that a good Spring cleaning is in order.