Bi-fold Mirror Doors on Roller Track

The mirror doors have top and bottom tracks. This is a photo of the spring-loaded top roller. I disengaged it from the track to show as full as possible a photo of it. As you can see, the spring doesn't lay flat, which results in the doors not 'meeting' evenly and making them hard to close without pressure.

I hope my explanation and the photo are clear enough for identification. Sorry, but I don't have any additional information.

Thanks in advance for any help in identifying the part.

Here's another photo that shows the doors not meeting because the one with the malfunctioning spring roller jams against the other door. If I force the door, it closes and lines up as it should.

Very helpful, Paul. Much appreciated.

Annette