Horizontal sliding window stopper

A home owner from Jersey City says:
Hi, i have a large horizontal sliding window from Traco. I am missing the cover of the window children safety stopper. My neighbor told me the cover and the black piece together eill stop the window. Can you help me to find it?Thanks.
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Bob from SWISCO responded:

Thanks for posting. I need more information to be able to help. Could you show us the part removed from the window? Dimensions would also be very helpful. Do you know who made the window? This information may help us narrow down possible options. Many thanks.

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