crank arm won't fit

A quick learner from New Jersey says:
I recently ordered the Swisco 39-188, but my window won't close.
Here you see the 39-188 against my old operator. What can I do?
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. I'm sorry to hear the 39-188 didn't work. Based on this picture, I think you should have gotten the 39-090 instead. The shape of the gear arm is closer to your original.
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