metal bifold door pin and connector

This looks like a somewhat older bifold door, but we may still have the hardware you need. Before I suggest anything, I will need detailed dimensions so that I can check our stock for something that will fit.

Specifically, can you tell me the diameter of both the metal post and the top of the nylon cap? Note that I don't need the "brim" of the nylon cap, just the very top diameter. Thank you!