Nylon window slider

A quick learner from San Rafael CA says:
I'm looking for these small Lego sized nylon sliders that sit on the top and bottom of the window pane frame.
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Emily from SWISCO responded:

Hi there and thank you for reaching out to us. It's hard to say what you have with your roller installed but start by taking a look at the 87-175. Remove your old roller from the window and compare the dimensions with ours to see how they match up. 

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