Closet door rollers.

A quick learner from Illinois says:
This roller is 50 plus years old. Has an adjusting screw for height. What is an exact replacement.
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Bob from SWISCO responded:

Thanks for posting. There's a few different hangers that might work here. It depends on the dimensions, particularly the diameter of the wheel and the 'offset' of the tab that holds the wheel. See our 23-024, 23-025, 23-031, or 23-047. Look at these to start and see if any of them match what you need. Let me know what you find.

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