Extra arm on casement operator?

A contractor from Chicago says:
I can find these elsewhere as "Prime-Line Entrygard Right-Hand Dual Arm Casement Window Operator." Mine appear to have an extra arm stamped "30744" This arm is not shown on any replacements I have seen. Can you help?

I need to order three of these for a customer ASAP.
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting. Have you seen our 39-031 & 39-032 yet? These appear pretty close to your hardware. Compare the measurements and let us know if they differ in any way.
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