Bifold Door Pin Cap, National

The top pin cap broke. The doors are at least 20 years old. Mirrored bi-fold doors. Diameter of plastic cap is 3/4". The hole in the bottom of the cap is 1/4". The pin is 1/4" x 4" long. Hoping you can help me find what I need! Thank you

Looking for this assembly item number, if it is unavailable, the item numbers for the individual parts. There are no makers marks anywhere on the doors or the hardware for them. Thank you!

I Need another metal post and the plactic tips. I just do not know what size will replace it. I also need 2 new spring post to click them into the top. This is for an 66 years old garage furnace closet. The doors are nolonger bifold, they where fused together so they only swing out pivot like a ... (cont.)

I was considering replacing my clunky pin assembly as you recommend but the hole for the clamp is not square. Is that a problem? Also, the pivot clamp needs replacing but I don't see an exact match. Photos attached. Thanks!

The bi-fold door lower guide needs to be replaced. the guide is similar to your bifold door cap. Part no. 21-103. The apart I have is 3/8" where the 21-103 is 1/2". Is there barrel of 3/8".