Window casement operators - which replacement?

A quick learner from Santa Barbara, CA says:
I need about 7 of these. Not sure how to measure them. The base of the operator (corresponding to the hole in the sill) measures a little over 4 inches. The arm of the operator measures about a foot.
User submitted photos of a window operator.
A quick learner from Santa Barbara, CA says:
More info. The operators are labeled "Truth". Here is one with the sill removed.
User submitted a photo of a window operator.
Profile picture of Paul
Paul from SWISCO responded:
Please see our 39-014 and let me know if this could be the operator you need.
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