Sliding Window roller

A quick learner says:
The attached picture shows the roller on each side at the bottom of the sling window.
Please let me know if you have them.
Thumbnail of the uploaded file named image0(2).jpeg
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Lauren from SWISCO responded:

Hello, thank you for posting! 

Please compare the dimensions of our 87-177 Sun-Air roller assembly to your original for a good fit. 

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