my sliding widow bottom, left and right ;

A quick learner says:
I guess I should replace them,but couldn't find the items and I dont know the name
Thumbnail of the uploaded file named IMG_1458.JPG
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Tom from SWISCO responded:

It's tough to make out exactly what kind of roller you have, but it looks strikingly similar to our 87-176. Look it over and let me know if this is a good match.

A quick learner says:
Thank you very much Mr Tom.
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Tom from SWISCO responded:

My pleasure! We're always here to help if you have any other questions.

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