A quick learner from Durham NC says:
I have this Stanley crank that I need a replacement for.

I have attached pictures.

It is the left crank.

Would really like to replace both left and right cranks.
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Bob from SWISCO responded:

Thanks for contacting SWISCO. I can't be 100% sure without seeing all the installation holes of your old operator; but take a look at our 39-057 and 39-058 Stanley Operators (Left and Right orientations). Compare with your old parts and see what you think! 

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