looking for a windor operator

A home owner from London,Ontario,Canada says:
May 26, 2017
Here are some pictures about the truth window operator. Just let you know, there is a number on the arm which is 40051B, and also other number on the back of operator which is 45251.
Casement operator
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Tom from SWISCO responded:
May 31, 2017
Thank you for reaching out to us. Please take a look and compare your operator to our 39-365 single arm operator and let us know if you could use this as a replacement for you.
9-1/2" Single Arm Operator, SS Roller
9-1/2" Single Arm Operator, SS Roller
39-365
$30.99
Anatomy of a casement window
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