casement window operators

A quick learner from Bayport, NY says:
I need two right and two left casement window operators. They are white. A picture is attached. I see two different model numbers on your site that could be the right one. How do we differentiate?
A customer submitted photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for contacting us. This operator appears to be similar to our 39-089 & 39-090 window dyad cranks. You could also look at our 39-187 & 39-188. Are these the product numbers you were referring to? Our 39-089 & 39-090 are similar to our 39-187 & 39-188 except for their crank arms; between the two pairs, they each have a different zigzag shape position.
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