I need this Casement Operator Track

A handy person from Oak Lawn Illinois says:
If you see this part is under the bottom part of the window is the one I need thanks
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:

This might be our 49-528, which interacts with a track slider like the 39-529. Let me know if this seems right. If not, please show me the window operator that uses this track in its entirety (gear box and link arms). 

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