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Is the frame good and you just need a new screen? Most local glass shops can do that for you. IF you need a whole new unit, I need the make of the window as they all are different. You might have to go to Thor for that. Let me know if you need that contact info.
You would need to find out who made the window and I have no way to do that. I suspect Thor may be able to tell you and perhaps even supply a part. I will opt out of this in case another tech here on site can offer something.