Patio door latch plate

A home owner from Illinois says:
The spring is broken on my locking mechanism and cannot lock patio door.
In removing old assembly dropped inside the door. Need latch 3-1/2 by 1- 1/2
Looked at all my windows and there is no manufacturer label.
Can you help?
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Tom from SWISCO responded:

We should be able to help, yes. Before I recommend anything, can you show me a photo of the part in question?

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