A quick learner from USA says:
I need about 4 of these if you have them. The first part of the arm is about 4" long, the second part of the arm is approximately 11 1/4" long. The overall length is approximately 15' long. The crank housing is 4 15/16" wide that fits into the window frame itself. I hope this helps.
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Casey from SWISCO responded:


Take a look and compare the specifications of the 39-239B awning operator to your assembly. Thanks for posting! 

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