Acorn Window roller

A quick learner from Setauket, New York says:
The window is about 21 years old. This roller is on the bottom of the window. Please let me know if you need anything else.

Thank you.
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Paul from SWISCO responded:

Hello,

It looks like you'll need the 87-170 Acorn roller assembly. Take a look and compare the specifications listed on the product page to yours. Thanks for posting! 

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