tilt window parts

A home owner from MA says:
Can you guide me to the little gray part that stops the tilt window slide? I've lost 2. Thanks.
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Tom from SWISCO responded:

Hello! That appears to be a match for our 20-020. Look it over and let me know if you agree, or if you had any questions.

Dimensions for 20-020
Dimensions for 20-020

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