Tracy: See pics of shower curtain guard and plexiglass on side of bathroom sink cabinet in my Roo 19. It's a mirror image of yours, I think.
I had to move some of the "rivets" that hold the shower walls to the trailer walls as they were where I wanted the shower guard to go. I used a razor blade to cut the old ones off and shot some caulk in the holes. I got some GM panel retainers at my local auto parts store (last pic). The only ones I could find had those little tops on them. You may get luckier at your auto parts store. I cut the tops off of them and used them in new holes close to, but away from, the shower guard.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10