find replacement part for casement window crank

A quick learner from Windsor Ontario Canada says:
March 24, 2021
I have 35 to 40 year old DUCANA windows(Chatham Ontario Canada company)
The name TRUTH is stamped on the arm.
I need both left and right cranks.
I have found 9.5 inch and 13.5 inch and 11.5 inch cranks but the measurement as I read it is 11 inches. Center to center.
Is it just poor measuring?
Any help with part numbers would be great.
Do I need to get new handles or can I use the old ones? 12 teeth on crank shaft.
Thanks for your time and effort.
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Casey from SWISCO responded:
March 25, 2021

Hello,

Take a look and compare our 39022 and 39-023 operators to your original hardware. Thanks for posting! 
Rear Mount Casement Operator, 11"
Rear Mount Casement Operator, 11"
39-022
$65.29
Rear Mount Casement Operator, 11"
Rear Mount Casement Operator, 11"
39-023
$65.29
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