Need replacement parts for 1 bifold set all pins top and bottom

I'm sorry to say that I don't recognize this pin, though it may be just because it's obscured. Before I can recommend anything, can you remove it and show me a clear picture of the assembly by itself? Can you also tell me the exact diameter of both the shaft and the part of the nylon cap that goes into the track? Finally, would you happen to know who made this door?