Plastic screw in windows

A quick learner from columbus ohio says:
Hi, the plastic pieces holding the tops of the storm windows in place are mostly all busted, so the storms 'slip' down. The windows themselves are TwinPane1982A. The storms don't have any markings on them, but they are from the same time period. It seems like a simple enough plastic piece, with a single screw to keep it in place. I just can't find it anywhere! Can you help?
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Casey from SWISCO responded:

It looks like you have some kind of tilting storm window corner key. It is hard to see yours well while it is still installed. Take a look at our Corner Key; 95-029 and Sears Tilt Pivot; 95-182. Both of these tilt corners attach with a single screw. Compare your dimensions to ours to see if one of these could work for you.

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