A home owner from Naperville Illinois says:
Nuprime. Entrygard 20544

I'm breaking all over the place!! Do you have these parts til I can afford to replace the windows? I would need 3 knob things!!!
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Tom from SWISCO responded:

It's hard to tell what you have with the camera zoomed in on the part. It looks like you might have a dual-armed operator, in which case my first recommendation would be the 39-031 and 39-032. Carefully review the pictures and dimensions we show on their store pages and let me know what you think.

If the only issue is the operator, you definitely don't need an all new window. That's usually only necessary when the frame is damaged, but for parts like this you can just swap them out and everything should be working as good as new. You can probably get another 15 years out of these windows. Even glass can be replaced. A lot of professionals will tell you to buy an all new window, but don't always believe them!

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