casement arms

A quick learner from purchasing says:
I'm pretty sure the picture has a left and right arm although I'm not sure which is which. They both have the name truth and a number of 33177A. On the other sides it has the #31133C and the other has a #31133 B. Can you help me out? Thank you!
Thumbnail of the uploaded file named casement arms sv498,499.jpg
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Emily from SWISCO responded:

Hello there!

It looks like you need a new hinge set. Start by taking a look at our 36-048 and 36-049 2-bar hinge sets. Look over the dimensions for each and see if either match up for what you need. Just be sure to replace the top and bottom hinges at the same time. 

How to Replace a 2-Bar Hinge Set on a Casement Window
How to Replace a 2-Bar Hinge Set on a Casement Window
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