Spring Loaded Top Pivot

It is 30 inch bifold mirrored door. I need track both for top and bottom. I need the gliding roller that glides inside the track and whatever hardware that goes along.

I am looking for the spring loaded top pivot referenced above and in the pictures attached. The ones I've found at big box stores do not fit. These are doors from the late 70's/ early 80's. Thanks in advance for your guidance.

Pin diameter = 1/4" Pin height = 9/16" Pin cap inside diameter = 1/4" Pin cap outside diameter 6/16"

Customer Service, Please offer suggestions! I need to replace my aging Stanley "17-4405" because the plunger spring is no longer “springy” enough to keep the door elevated. Please advise what you recommend to replace or repair the Stanley 17-4405. Please see these pictures. ... (cont.)

I have glass mirror bifold doors that are close to 35 years old. The guide pin part is Acme17-4405. The guide pins work but the guide rollers have disintegrated over time. Will the guide rollers you have work with these? If so, how do you get them in the tracks.