Crank window operator

A quick learner from USA says:
Hello I'm looking for a new operator for my crank windows in my patio the one on my window looks identical to the one in your video on how to install before I order it I'd like to just know the exact part number to order. Thanks Robert
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Casey from SWISCO responded:

Hello,

Unfortunately, it's impossible to determine the correct replacement for your awning operator while it is still installed. We would need to see your operator fully removed from the window to compare the arms that connect to the window linkage to our selection here. Thank you. 

A home owner from Patio says:
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Casey from SWISCO responded:

I would recommend starting by comparing the dimensions of the 39-061 Keller operator to yours. If you notice any discrepancies, please write out your exact dimensions and we can go from there. 

Dimensions for 39-061
Dimensions for 39-061

Alternate view of 39-061
Alternate view of 39-061

How to Replace an Awning Window Operator [1080p]
How to Replace an Awning Window Operator [1080p]
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