Mirror closet door track wheel

I am trying to identify and purchase this part. It is the pivot top part of the door. This part has a white wheel with a metal stem through it , a spring, then it looks like it was attached to the bracket. This either broke off from the bracket or came off. The white little wheel goes in the track. The actual door is a bifold mirror glass door. I went to the local store and the gentleman could not help me. Says I need to look on line. But I don?t know the manufacturer. It may be that the bracket came with this already attached and then the bracket is screwed on top. I removed the. Bracket to take with me to the store. 2CM round. By 1 1/2 long One last picture please, I wanted to show,that the pin does appear to belong in the bracket and the measure in inches is 3/4 long and the while wheel is in inches 3/4 as well