need spring, pin and metal clip to hold spring (not sure of name parts)

I'm afraid that I cannot identify what pins you need based on the provided information. In order to make a recommendation, I will need to see a clear photo of the pin assembly in question removed from the door and without obstruction. I will also need you to write down its exact diameter, as well as the diameter of the nylon cap that goes into the track. From there, I will do my best to find a match.

Please note that due to the age of the door there is a good chance we won't have a working replacement for your bifold door setup. I will do my best to find you something to match the size and design needed, but I don't want to get your hopes up.