Window hardware replacement

A quick learner from Hudson, Wi says:
I have several window arm assemblies that need to be replaced. This is and example. I'll need several of these. What measurements do I need to know what size to get for each window?

Thanks,
Adam
Thumbnail of the uploaded file named casement link arm
Thumbnail of the uploaded file named window hinge
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Emily from SWISCO responded:

Hi there Adam.

Thanks for reaching out to us. Our 39-316 comes to mind. This looks like it may be an updated version of your assembly. Have a look and see if the specifications match what you need.

For the opposite side, see the 39-315.

Alternate image for 39-316
Alternate image for 39-316

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