Wood sliding closet roller 1/2" diameter

Do you have any closet door rollers with a half inch or 5/8" wheel? It is just a wood sliding door. The rollers are missing from one side and I haven't pulled it off the track to take out the other side (am trying to avoid that if possible). The rollers are convex. I could get by with a setup with a single roller setup with probably up to a 1/2" offset if I can get one with a small enough roller. At local stores the smallest I have been able to find is a 3/4" roller and it is too big to fit in the track. If there is any other information you need. please let me know.