Replacement crank for casement window

A quick learner from New York City says:
Greetings.
I would like to replace the 2 cranks on my front bay casement windows. I was not able to find any identifying markings. Hopefully you could help. The measurements on the window itself are 16.5inch by 55.5inch
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Casey from SWISCO responded:
Hello,
Unfortunately, your GU operator was discontinued but take a look at the video below where we replace it with the 39-316 and 39-317 operators. Thanks for posting! 
How to Replace a Discontinued GU Operator
How to Replace a Discontinued GU Operator
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
VIDEO
WATCH >
How to identify casement and awning operators
How to identify casement and awning operators
GUIDE
READ >
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