need help replacing MI window part

A quick learner from druango co 81303 says:
August 1, 2021
It's the small black plastic piece in the one photo.
Thumbnail of the uploaded file named PXL_20210801_145326365.MP.jpg
Thumbnail of the uploaded file named PXL_20210801_145410595.MP.jpg
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Tom from SWISCO responded:
August 5, 2021

It's difficult to make out what you have while it's still obscured like this, but it could be a match for our 39-529. Look this part over and see what you think.
Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$1.20
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