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87-235 Sliding Window Roller, 1/2" Flat Wheel

I need to replace my roller assemblies and need to understand how they are secured in the window frame. Are there installation instructions?

To me it looks like this Slide-Co 172581 Sliding Window Roller Assembly with 1/2-Inch Brass Wheel,(Pack of 2)

Need help identifying this sash.

The etching on the windows says Gapco 2Q92

1 1/2" long, 13/16" wide, 1/2" tall plus small tab in middle to lock into window

Alenco window. Attached are photos of the roller and base frame of window that shows the installation of the roller. We purchased rollers. 87-203 thinking they would work. However, the tab prevents the roller from being inserted into the frame. What roller do you recommend?