Thanks for contacting us. We may have a replacement for this pin but we'll need more information. Can you write out the diameter of the cap, where it fits into the track, as well as the diameter of the pin shaft? It would also be a great help if you knew who made the door.
I'm afraid it isn't possible for us to know what else you need, however. You'd need to examine the door and replace whatever you see that is broken.
I believe you have a Slimfold bi-fold door. You are showing part of the 21-007 spring-loaded guide pin. We also pulled up related parts on this page that you might need and some useful media guides.
