Need hardware for Fenestra bifold metal door

I'm sorry I can't find your pin in the archives of Fenestra, so hold off and please don't procure anything else while I try and investigate this for you. In your third photo, are the nylon round cylinders the pivot brackets for the track? What is their inside and outside diameter? Does the 5/16" grommet, our 21-149, seem to be the correct size for the pin? Does the 1/2" seems to fit the square hole in the door? The nylon cap on the 5/16" threaded pin, is it 3/8" in diameter and is it missing a wide brim? Let me know the answers to these queries and we'll proceed from there. 

Okay thank you for the dimensions. For the threaded pin you show, you can use the 21-033 pin with one 21-149 grommet. It will work with the old track with the cylinder pivot block or the new track. The spring loaded pins, 21-007 should work with the Grommet 21-149 in the door and to secure the door pin, the 21-155 palnut. Again the pin should work in the old and new track.

The grommets go in the square cut outs where you are placing the pins. The 21-033 thread pin will require one grommet in the lower cut out and the nylon nut that comes with the thread pin will act as the top grommet. You won't need the cylinder washer. For the guide pin 21-007, you will need two grommets. After you install the spring guide pin, you can lock it with the palnut on the metal portion of the pin to prevent it from falling out when installing the doors on the track.