Need to know what replacement part to order for a MW window

A home owner from 28037 says:
This part is on a MW window.
Thumbnail of the uploaded file named Window Crank.jpg
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Emily from SWISCO responded:

Hi there!

Take a look at our 39-315 and 39-316 operators. Compare our dimensions to your current operator and see if they match up for what you need. Keep in mind, our operators don't come with the little metal clip at the end of the arm. You can reuse your old one or you can buy our 39-105 separately. 

A home owner from 28037 says:
Do you have the lower arm that is rusted in the picture?
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Emily from SWISCO responded:

Please see our 36-048 hinge set as a substitute as long as you replace both sides at the same time.

A home owner from 28037 says:
Please clarify what you mean by "as long as you replace both sides at the same time". Both sides of what?
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Emily from SWISCO responded:

My apologies! The top and bottom hinges need to be replaced at the same time. 

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