Window Part Needed

A quick learner from USA says:
Hello:
I am in need of this plastic part that is attached to the window and the steel track as when you move the window up and down to keep it stable.

Would appreciate, if in stock to purchase 4 of these.

Please advise and thank you so much for your assistance.
Thumbnail of the uploaded file named Top sash guide
Thumbnail of the uploaded file named Broken guide
Thumbnail of the uploaded file named Guide back
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Casey from SWISCO responded:

Hello,

Your top sash guide resembles the 18-161. Take a look and compare the dimensions below to confirm they match up to your part. We'll also relate a few videos on this page to assist you. Thanks for posting! 

Detail of 18-161
Detail of 18-161

Profile view of 18-161
Profile view of 18-161

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