Plastic window roller

Hello, This roller is from a metal frame window at our condo that was built in the early 1980s. There are no markings on the part or window that identify a manufacturer. Roller attaches to the window with a screw through the round hole visible in the roller. The wheel diameter is 1/2 inch. The roller is 1/2 inch wide and 1 1/2 inches long. If you cannot find an exact replacement, any advice on something similar that will work would be most appreciated. Thanks! -Andy