Nylon track guide

A handy person from Lake Orion, MI says:
I'm trying to get a part number for this "pivot capped track guide" that needs to be replaced from a 1990's vintage Stanley Monarch mirrored glass bifold door. I will need 4 of them but only one is seriously worn out. Or is there a replacement upgrade?
Thank you for your help.
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Tom from SWISCO responded:

Hello! This looks like a match for our 21-174 roll guide, which is a fairly common sight on many different bifold door tracks. Look it over and see what you think.

A home owner from Ely,Mn says:
Is this wheel available? I need 4.
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Tom from SWISCO responded:

We still sell the 21-174, yes. All orders can be placed directly on our site at your convenience. 

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