Is there a term for this carriage door stay?
If you can't find a pre-made set, I'd imagine you could build one.

Use a heavy duty wheel mount (i.e. get rid of the wheel) for the portion on the door.

Find a piece of &quot;C&quot; channel for the piece on the door header. Cut a slot in it with a grinding wheel.

Pick another, smaller piece of &quot;C&quot; channel for the slider between them. Cut a notch for the catch.

Attach a piece of chain.