Top right rollers

A quick learner says:
They are old heavy bifold closet doors. All the right sides are off track. I want to replace these top rollers. I need 3. Is there are easier way to put them back on track. Thanks.
User submitted a photo of a bi-fold door roller.
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Paul from SWISCO responded:
Thanks for posting. I will try my best to help you replace this. First, can you give me the diameter of that top nylon roller? Thanks!
A quick learner from Jersey City, NJ says:
The diameter is about half inch.
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Paul from SWISCO responded:
Perfect, thank you. Check out our 23-142 and 23-141 and let me know if these are what you need. As for putting them on the track, there really isn't a trick to it or anything, unfortunately.
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