Bifold Closet Door Top Guide
thingiverse
This is the top plastic guide for a bifold closet door that runs on the rail. I couldn't find just the part for sale anywhere without buying the whole door for one I was missing. I did see other designs here, but none fit my door. It's pretty small, so try this or others. Measured the dimensions of the ones I do have, designed it in Fusion 360 and printed it. It took a few tries to get it right.
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