Need help identifying this Atrium window part

A quick learner from San Jose, CA says:
Hi, the top corner of our Atrium brand window broke off and we found a plastic part screwed to the top broken. Please help us identifying the part so we can order a replacement. Thanks!
User submitted a photo of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
Hello, Brittany. Look at our 18-171 and let me know if you think this could be a good match.
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