I think I need 39-031 with a smaller arm

A quick learner from Kennett Square says:
I think I need replacement part 39-031 but the smaller arm is not measuring 4 7/16.
It measures 3 3/4"
Is there another part with those dimensions?

User submitted a photo of a window operator.
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Tom from SWISCO responded:
Sure thing, Sue. how about our 39-155? This looks like it's a little closer to your hardware. What do you think?
A quick learner says:
Yes, you are correct.
That is exactly the part I need.
Thanks for your help!!
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Tom from SWISCO responded:
It was my pleasure. Let me know if you need anything else!
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