Slimfold bypass closet doors - 4'opening, 2 doors

A quick learner from OH says:
Hello, just purchased a 30 year old home with two sets of these Slimfold bypass sliders. Nylon guide rollers on the bottom only are shot. Looks like the assembly is all one unit. Can you help? Need 4 or 2 for each door on one set of doors.

Thanks, Greg
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Bob from SWISCO responded:

Check out our 23-043 , 23-198 , or 23-176 Closet Door rollers. Compare the dimensions of each to your old hardware and let me know if you think either could work for you. 

Sliding closet mirror door rollers and tracks
Sliding closet mirror door rollers and tracks
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