You could probably make a set if you are handy. Or make a different style panel than the mirrored one if you prefer. It's just standard door track hardware. If you aren't handy, I'll bet a local cabinet shop could whip them up easily.
You could also try an RV salvage yard like Colaws
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL