Need Help with finding dual arm awning operator

A handy person from Tucson says:
I believe its 16 1/8". The issue I am having is that the body is a rear mount. Notice in one of the pictures there are two screws that go through the window frame that hold the main body in. Unfortunately I do not know the manufacturer of the window.
Thumbnail of the uploaded file named Arms
Thumbnail of the uploaded file named Base
Thumbnail of the uploaded file named Base arm
Thumbnail of the uploaded file named Window
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Dave Sr. from SWISCO responded:

Hello,

Take a look at the rear-mounted 39-473 awning operator, which resembles your assembly. We'll include the dimensions from our product page below to compare to yours. Thanks for posting! 

Dimensions for 39-473
Dimensions for 39-473

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