Searching for Permaseal window part

A quick learner from New Jersey says:
Hi,

I was folding my bathroom window inward and the plastic part above (which is inside the mounting frame) broke. It's approximately 3 inches long. I believe the window is a Permaseal 1450 series. Any idea where I can get a replacement plastic part?

Thanks,

-Gary
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Casey from SWISCO responded:

Hi, Gary. This looks like a Double Support Detent Clip, 15-181 for your coil balances.

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