Casement window part

A contractor from VA says:
Hi everyone,

I have two picture of the window, and I'm looking to replace this part showing in the pictures.
So I don't know if you can figure it out without any measurements please or i have to get the measurement first.
Thank you very much!
Thumbnail of the uploaded file named Operator arms
Thumbnail of the uploaded file named Operator base
Profile picture of Casey
Casey from SWISCO responded:

Hello,

Your operator resembles the 39-329 at first glance but the dimensions would be the determining factor. We also offer the 39-330 opposite-handed version if needed. These operators are used with the 39-553 and 39-554 Roto sash brackets, along with the 39-232 folding handle. Review the specifications of these parts and let us know if you have any other questions. Thank you! 

Alternate image for 39-329
Alternate image for 39-329

Side profile view with measurements
Side profile view with measurements

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