Metal bifold doors

I'm afraid it's going to be very difficult to narrow down the bifold door hardware you need without seeing the original pins. We typically need the diameter of the pins, as well as the diameter of any caps atop the pins. is there a sticker on the door that says what the manufacturer was? That would help narrow things down at least. 

I believe this is a Model B door made by Evans manufacturing. Now I'm not certain, but I believe they older Slimfold door parts for their doors. We have newer versions of these parts that might work for your doors. The 21-001 bottom threaded pivot pin, 21-007 top and bottom guide pins and 21-154 pivot rod clamp may be the parts that you need. Ultimately you're going to need to carefully care the dimensions, especially the pin and cap diameters, to confirm this.