Roller guide

A quick learner from Whitecourt, Alberta says:
Hello, the top and bottom roller guides require replacement on my old metal bi-fold doors. The top roller guide is 4" long and the bottom is 5" long. I need 5 of each but I would take a few spares if you have them. The plastic wheel is broken or missing on the roller guides.
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A quick learner from Whitecourt, Alberta says:
Looking through your parts, I'm wondering if the only the plastic piece on top needs to be replaced?
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Tom from SWISCO responded:

I think there's a good chance you can get away with just replacing that nylon cap, yes. Before I recommend anything, can you tell me its diameter? Can you also tell me the diameter of the pin that it fits on top of? You may find it easier to measure an undamaged version of this same assembly, assuming you have another on your door.

A quick learner from Whitecourt, Alberta says:
Thank you for your response. The pin it fits on is 1/4" diameter. An undamaged cap measures as follows: 1/2" H 5/8" W on the bottom. 3/8" W on the top
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Tom from SWISCO responded:

Thank you! The closest match I could find was our 21-101. This fits a 1/4" pin, but the top part is 13/32" in diameter. Do you think this could still work for you?

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A quick learner from Whitecourt, Alberta says:
I'll have to measure the track opening.
Thank you!
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