Need Help With This Closet Roller

A quick learner from Des Moines says:
This is a plastic piece that slides over a 11/16" metal track. They were made out of plastic and probably installled 60 years ago.
I need eight of them. Can you help identify?
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Bob from SWISCO responded:

Can you remove the pivot pin for a better look? We'll do our best to assist you from there. The diameter of any pin or the cap atop the pins would also be most helpful. 

A quick learner from Des Moines says:
Try this picture.
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Paul from SWISCO responded:

Thank you for your correspondence. I am unable to find the nylon guide that rides over the track, but if the point of your threaded pin is 1/4", you might be able to substitute our tracks, the 21-450 , 21-452 or 21-455 . The track is 1" wide by 1/2" tall. The metal pivot and nylon roller guide accepts 1/4" pins. Please review and see if these parts could work for you. .

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