Pivots and sliders needed

I was called out to troubleshoot this set of old bifold doors today. The doors are 93 and 1/2 in tall and about an inch thick. The doors fit in the 4-ft wide opening. One of the doors is off track, and the other one is on track but it seems like the sliders are not correct for the track. I would like to get all of the pivots and sliders for these two doors, and any other parts that would be required to make them slide smoothly. I've told the customer that these are probably better than anything that they would get, as they're considering making the opening smaller and installing a regular 80-in high bifold door. This is in a doctor's office, so I imagine it needs to be pretty robust. Thank you.