Plastic slider

A quick learner from Vermont says:
Goes on underside of casement window. Fits in aluminum track.
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Tom from SWISCO responded:

That looks like the shoe found on the ends of the arms for our 39-312 operator. This shoe is unfortunately no longer sold separately, though. We can only sell you the complete operator. I am sorry for the inconvenience. 

There's also no guarantee that the 39-312 is what you want. This particular design was used on a few different parts, if memory serves. But the 39-312 is still a good place to start.

How to identify casement and awning operators
How to identify casement and awning operators
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