Crank for window casement

A home owner from St. Paul, MN says:
I need to replace a window crank on my mother's window. Inside the house, it would be the right window as you face the set of 3 windows side-by side. The crank on the left window has R30842 imprinted on it, but I need the opposite one for the other window.

Someone did replace it for her a few years ago with an off brand, but it broke already.

Can you advise me what part to order?
User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
It's very hard to tell what you have based on this picture, as it is very small. It looks somewhat like our 39-031 and 39-032, but I cannot tell. Carefully compare them to your part and see how well they match.
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