I've used Home Depot G-3038 which are way too weak to roll the windows and therefore do not last. I can cut the track with a Dremel tool to adjust the length for a better roller and re-drill the holes for locating and securing, if needed.
There are currently two sets on the bottom of each window. Window weights +40 lbs.
The goal: a roller that permits easy sliding the window.
Thank you in advance and have a great day. Rusty