Folding tub door rolers

A quick learner from usa says:
Probably made in 1960's, these Teflon or Nylon 5/8" wheels are riveted onto a square block of similar material that fits into a rectangular opening at the tops and bottoms of 6 aluminum dividers/supports for vinyl flexible curtain segments.
Spring loaded, all rollers, top and bottom.
Thumbnail of the uploaded file named Two sing;le wheeled  rollers installed on end pane
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Paul from SWISCO responded:

Thanks for the detailed information and photo. Could something like our 10-131 sliding sectional shower roller work for you? Look it over and get back to us with some thoughts.

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