Bifold Door cap cracked

A quick learner from Florida says:
Attached are photos of my bifold closet door.
The bottom disk cracked.
Do you know which would be the replacement?

Also, how do I get the disk in the track when I get it? Do I have to pull up the track to get the disk in?
User submitted photos of bi-fold door hardware.
Profile picture of Paul
Paul from SWISCO responded:
The nylon disk looks like our 21-174. You will need to remove track to slide in the nylon guide.
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