Please help!

A home owner from Cheshire CT says:
November 9, 2020
The part number says c-9400-1 arm length is just over 8 inches. The window type is Anderson. Any direction you may have would be great. The number on the arm is 1521101 Brass plate underneath reads f-9400-8 with the letter B underneath
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Bob from SWISCO responded:
November 12, 2020

See either the 39-099 Andersen Awning Operator or the 39-331 E-Z Operator, depending on the attachment at the end of the arm. Look over both to see if one of these matches what you need. 
E-Z Straight Arm Operator, Andersen
E-Z Straight Arm Operator, Andersen
39-331
$29.17
Andersen Casement Operator Adapter Plate
Andersen Casement Operator Adapter Plate
39-362
$21.45
Andersen Awning Operator
Andersen Awning Operator
39-099
$29.98
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