Plastic guide for a sliding window

A contractor from Roseville, MN says:
March 30, 2011
I have looked at the guides on your site and I am not able to tell which one would replace this. Are you able to help me?
The length of it is 1 11/16".
user submitted images of plastic guide roller
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Mike from SWISCO responded:
April 1, 2011
We believe we may have located a replacement window roller that will work with your application. An update will be made to the discussion board as soon as the product is available and online for you to view.

Thank you for your patience.
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Donna from SWISCO responded:
April 7, 2011
Hello,
Take a look at SWISCO product 87-061, Acorn Sliding Window Roller Assembly
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