Plastic piece used in double hung windows

A quick learner from Hanson Ma. says:
I have received the weatherstripping I need for my windows but this plastic piece which may be called a keeper is what I'm looking for.I could use about 5 of them
Thumbnail of the uploaded file named 27CE64C4-BC5C-4E8D-9AD7-19CD9CBC7342.jpeg
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Tom from SWISCO responded:

Hello! This looks like a match for our 15-056. Look it over and let me know if you had any other questions.

Alternate image for 15-056
Alternate image for 15-056

A quick learner from Hanson,Ma says:
That is definitely my pivot retainer.I've been weatherstripping my windows and 20ct would be great.26yr old windows will break some more of the retainers during the process
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