It'll be hard to make a recommendation without the original hardware, but let me a couple pictures of your existing bottom door guides and I'll see what I can come up with!
ok I looked in back of the doors and they are "Benchmark". all the bottom hardware is missing. the doors are on with the top track only and pivot hinges with l shaped brackets on the bottom (wall)ends. I need a glide for the open side of the bottom to support the door without a track. there is not enough room for a track because of new tiles.your 21-174or similar might do well if I could find a long pin with which to attach it.
thanks for your idea. it sounds possible. I will also need some sort of molly to anchor the bottom end pivot brackets. do you also have replacement bottom pivot pins, brackets, and necessary hardware. let me know so I can put the whole thing together and order. thanks