Replacement casement operator

A quick learner from Honolulu, HI says:
Please help me. I need to replace the hardware for (3) bathroom casement windows, and I need to order the parts which all look alike to me. See: attached pictures of the hardware I have and a picture of the casement window parts. What parts do I order (3) casement windows.
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the dimensions of the two operator pairs that we've related to your assembly, paying close attention to the length of the arm that attaches to the sash. Thank you. 

Anatomy of a casement window
Anatomy of a casement window
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