Lance 1995 Child Restraint System for Upper Bunk

I'd bet that it doesn't differ much from the net-type restraint Lance is still using in other models- you can see it at about minute 3:40 in this Youtube video.

It's available as an option on new units, and from the description it sounds like the fabric/mesh wall is sewn to the pad covers at the bottom- probably a cross bar at the top? (Options page/descriptor)

You probably could order it from Lance, but at $258.00 I'd think you could come up with something that would work just as well!