A 2 1/4" c-shaped metal lug that extends out to fit into a window balance on either side of the window

A quick learner from Chicago says:
Window lugs that extend from the window to slide in to hook the balancer on either side of tgh3e window
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Bob from SWISCO responded:

Thanks for posting. Take a look at our 26-040. See if this is what you're looking for.

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