How to Install 21-058 Pin Cap

A handy person from USA says:
I'm repairing some old metal bi-fold doors for a customer. A cat urinated on the doors and bottom track for years and caused major rust damage. I had to add sheet metal and angle iron to the door bottom.

I'm hoping to replace the bottom track with 21-402, and pivot pin 21-002.

The upper track has pins similar to 21-058. Can you please explain how the plastic pin caps fit into the track? I can't tell if I must remove the track from the ceiling to slide them in/out from the ends, or if they snap in place.

Thanks for your help.
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Tom from SWISCO responded:

Thanks for posting! Our 21-108 guide slides out of the end of the track. You'll have to remove the track entirely to get those guides out. Hopefully that information helps.

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