Bifold Door Guide Pin, National

National metal door circa 1975 I need all four parts shown in the photos, hardware enouth for one door

I'm helping an elderly friend clean up her home and I want to fix this door. Should I replace the spring part?

Metal bifold door from 1979 era mobile home. Need to identify which parts I need. Have top and bottom tracks, but missing reciever pieces at top and bottom. Can take more pics if needed.

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.)

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!