Hi Swisco!
I have found most of the parts I needed, the 23-115 top pivots and the 23-120 roller wheels .... but, my bottom pivots are different than the ones I see you have pictured.
I hope you have the part or its equivalent so I can redo all the closet mirrored doors in my condo ... have lots!
I have attached 2 photos of one of my broken bottom pivots. It is the piece with the white plastic like collar. It inserts through a plastic block that is actually part of the bi-fold doors. The blocks appear to be in good condition. The 23-115 is it's opposite part / top pivot. I am going to replace all my hardware since the plastic is quite old. I can find NO names or text on any of the hardware.
Sincerely,
Tom