5/16x1/2 1-1/8 square

A quick learner from Michigan says:
5/16" x 1/2" x 1-1/8" square
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Dave Sr. from SWISCO responded:

Thank you for reaching out to us! I believe your corner is an older Silverline brand part, which is unfortunately no longer available. However, I recommend you take a look at the 95-205 and the 95-207 and see if you can adapt one of these to your screen frame. They still aren't exactly the same as your obsolete part but they are our next best options.

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