I have Kohler Sterling 5475-59N-G05 Shower doors and I am trying to find out what kind of rollers are on it. I want ball bearing rollers but if they are already on it then I won't need to buy them. I keep reading about rollers with brass inserts and am wondering what the difference is.

Take the rollers off and go to a bigger glass shop and tell them you want some roller bearing rollers to match.

Keep trying until some can give you what you want...

Good luck

Roger