Bifold door missing hardware from pin

A home owner from Washington DC says:
July 20, 2021
I have a bifold door that appears to be missing a piece from the top. The third photo shows one of the doors that has the full piece. The first 2 photos show the door that has the missing piece. As you can see, the pin is not secure in the door. I don't know what the missing piece looks like but it might be some sort of tube that goes around the pin. This hardware is original to our house, which was built in 1968.
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Paul from SWISCO responded:
July 23, 2021

Hello,

It's hard to say without dimensions, but take a look at our 23-122 top pivot/guide and our 23-195 7/8" nylon guide wheel. Compare our dimensions to yours and see what you think. 
Top Guide Pin
Top Guide Pin
23-122
$1.37
Guide Wheel, 7/8" Nylon, Top Guide
Guide Wheel, 7/8" Nylon, Top Guide
23-195
$1.70
Bi-fold Door Repairs
Bi-fold Door Repairs
GUIDE
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