Identify window crank arm replacement

A quick learner from Oshawa, Ontario says:
We need to replace 2 window cranks. One is a left side crank and the other is a right side crank. There are not a lot of markings, however Del Mar is inscribed on one of the parts, and there is a number 31538A on the arm of the right side window crank. We moved into our house 5 years ago and these were already in the house. I am unsure of how old they are. Any help in identifying these would be appreciated so that we can open and close our windows with ease!
User submitted photos of a window operator.
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Tom from SWISCO responded:
Thanks for posting! Have you seen our 39-031 & 39-032 yet? These appear very similar to your own hardware. Compare them to what you have and let me know how they match up.
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