Top Roller Guide for Wood Bi-Fold Doors

A quick learner from Louisiana says:
I have wood bi-fold door and the top guide rollers on 2 sets of doors have broken.

After looking thru your inventory I failed to locate the size rollers I need. My top guide rollers measure smaller than ¾" and bigger than 5/8".

It also appears to be between 16 MM & 18 MM.

If you can help me find the correct top guides I would appreciate it.
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Paul from SWISCO responded:

Hello,

Thank you for posting! We have gone through all our closet door hardware options and have not been able to find a top nylon roller with your dimensions. At this point, it might be easier for you to purchase a new bi-fold door track set like our 3' 23-504 for your doors. We've associated this track set and others in longer lengths for you to review. 

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