weathershield casement window cranks

A quick learner from 55808 says:
I am looking to replace the cranks on a weathershield casement window. It has a left and a right side. The numbers I found on it were 3581R and 3581L.
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Emily from SWISCO responded:

Hi there!

Start by taking a look at our 39-013 & 39-014 or 39-027E & 39-028E operators. Carefully look over the dimensions for each and compare them to your original assembly to see which one matches up for what you need. 

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