Casement Window complete

A quick learner from DeKalb, IL says:
We recently bought a house that has casement windows in it. Two of the windows have operators that are broken. I need to communicate with someone who can help me identify the item so that I can order it. The home improvement stores in this area do not stock the item that I need so I am reaching out to you for help. Thanks. skj
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Tom from SWISCO responded:

This operator looks like a match for either our 39-083 or 39-140, depending on the size you need. The measurement we use to differentiate between them is the "elbow" to "elbow" measurement, assuming the arms are folded up in the close position. You'll need to measure yours that way to confirm which of our two parts will be better suited for your window.

A quick learner from DeKalb, IL says:
I sent a photo showing the measure of the device as you suggested but have heard no further from your company. Status of my request please.
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Tom from SWISCO responded:

I'm afraid I haven't received another message from you. Were you able to measure that elbow-to-elbow measurement? Was it 16" or 21-1/2", or something else?

If it's 16", you can use our 39-140. If it's 21-1/2", you can use our 39-083. If it's something else, please tell me and I can try to find something better.

A quick learner from DeKalb, IL says:
It is 21 1/2 so would be the 39-083, right? If so I need to know the part number of the bracket which attaches to the window as it appears there are two possibilities. Thanks.
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Tom from SWISCO responded:

There are two possibilities, yes. You need to use the old bracket as a reference to know which one to pick. There's no way to know otherwise.

A quick learner from DeKalb, IL says:
So both brackets shown for the bracket I need both fit this new bracket?
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Tom from SWISCO responded:

Both brackets shown are compatible with the 39-083, yes. However that doesn't mean that either one will work. You either need one or the other, but without the original I can't really say.

A quick learner from DeKalb, IL says:
I think with your help I have it covered and thanks for all your help.
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