Bottom rail and parts for metal bifold door

I'm afraid I can't determine what you have from these photos alone. I will need more detailed photos of the pin assemblies themselves, along with dimensions so that I know what track they'll fit with (or if the track is even made anymore). Please let me know if that will be possible.

Thank you. Would you also be able to write out your dimensions, as requested above? We specifically need the diameter of the pin shaft and the diameter of the nylon cap, where it fits into the track.

You have the old style Slimfold bi-fold door. We don't carry the 30" track, but we do have the 36" which is our 21-401. If you are putting two doors together then you could even use the 5' long 21-402. 

For the pins, you will need one 21-002 bottom adjusting pin, one 21-001, and three 21-007 adjusting pins. We also pulled up some videos to help you.