Help Finding part for window

A quick learner from Nassau County says:
Hi,

I attached an image of the part I need. The end piece of the window knob circles in red has broken off from the bottom and does not attach to the window, it does not grab onto the window bottom frame to open and close. Please help find that end price or the full arm extension replacement, if possible.
Thumbnail of the uploaded file named 3080e15a-4654-4034-b16b-2b59c2c4e2ce.jpg
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Casey from SWISCO responded:

Hello,

Your shoe resembles the 39-281 that comes with certain Andersen operators. Review the specifications below to see how they compare to your part. Thanks for posting! 

Alternate image for 39-281
Alternate image for 39-281

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