Replacement Crank Operators (L&R) for old Andersen Casement Window

I could not find any label on the window. Andersen is stamped on the crank arm but no serial number. There was a stamp on the side of the window 12 84. I think these were put in during the late 70's early 80's. Can you assist in identifying what Andersen Operator Set I should order?

Thank you very much. After checking the measurements, you were right on.
Much appreciated.

Frank