Missing slider

A quick learner says:
Hi,

I have a window which is missing a black slider (or guide? Not sure about the name) like the one shown in the photo. Do you have it? Please let me know.

Thank you!
Anna
Thumbnail of the uploaded file named IMG_5571.jpg
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Casey from SWISCO responded:

Hello,

I would recommend removing your guide from the track and comparing the specifications to the 39-529 to confirm if it's the correct replacement. Thank you!

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