casement operators

A home owner from bethany, Connecticut says:
I would like to buy 3 operators like this one and 2 operators that open the windows the opposite way. the casement windows are Malta 7A4. probably from 1986 or so. thank you for your help
User submitted photos of a window operator.
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Tom from SWISCO responded:
How about our 39-013 and 39-014? These look similar, but double check the length of your arm. Make sure to measure it in the same way that we measure ours to be sure.
A quick learner from bethany, Connecticut says:
that model does not work. the length of the arm is 9 and 1/2 measured the same way that you measure yours
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Tom from SWISCO responded:
Ah, I see. In that case, see our 39-027E and 39-028E instead.
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