Closet metal bi-fold door part

A handy person from Allen Park, MI says:
June 20, 2019
I believe that I need part # 21-100.... a nylon guide post cap. However I am not totally sure that this is the correct part. The pictures that are included shows the two posts, the pivot post has a smaller diameter cap, which I do not need. I do need the nylon cap that is on the larger diameter guide post. I do not have a model number for the door as it is quite old and was already here when I moved in.
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Paul from SWISCO responded:
June 21, 2019

Greetings from Swisco.com. Without knowing the measurements or diameter of the part you are looking to replace, we can not give a precise suggestion. We have placed a list of possible replacement caps in a list on this page for your review. Look each one over thoroughly to see if any of these are a match.
Bifold Pin Cap, 3/16" ID
Bifold Pin Cap, 3/16" ID
21-106
$0.85
Bifold Door Pin Cap, National
Bifold Door Pin Cap, National
21-103
$1.02
Bifold Door Pin Cap
Bifold Door Pin Cap
21-109
$1.42
Bi-fold Door Repairs
Bi-fold Door Repairs
GUIDE
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