Bathroom door catch - what to search for?

Second trip in new van complete and we've discovered that there's a missing catch at the bottom of the bathroom door.

It's a 2006 Knaus Starclass and the door has a proper handle but it's connected to a bar similar to what we had on our old Bailey with the push button door.  There's a bar running from top to bottom which connects into catches at each end.  Part of the lower catch is missing.

Where I need help is what to search for?  Does anyone know what this part would be called?