8ft. sliding closet door roller (upper)

A handy person from Fort Collins, CO says:
Also trying to find replacements for an 8 ft. sliding closet door roller - three pictures attached. No remaining markings on doors or rollers - circa 1978.

User submitted photos of closet door hardware.
Profile picture of Paul
Paul from SWISCO responded:
Hello again, Steve. Looks like your door uses a flat ball bearing wheel. Can you tell me the diameter? That would help us locate a good match.
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