Window rollers

This is a roller from an aluminum frame double pane sliding window. The roller on the one pictured rusted and mostly disintegrated. Let me know if you need more details to help identify.

I have included some additional pictures. The first is of the roller still in the window frame. You can see that the roller housing fits in the window frame between the lower "tabs" and the upper "wings". To remove it from the frame, you have to back the screw out slightly that holds the frame corner together, then slide the roller housing back and forth so it can be lifted straight out. Dimensions of the nylon housing are 1 3/8 long, 5/8 wide, 1/2 tall. Wheel is 1/2 diameter, 3/16 wide. Ends of the axle are 3/16 diameter and it has ball bearings. The windows were installed in the mid 1980's. I could use a lot of these if I could just find them. Thank you!