Acorn 2500 series window frame roller units

A quick learner from Eastchester NY says:
April 17, 2012
The plastic bushings for these windows appear to be about 1.75 inches in length and about 0.75 inches in width. The highest height of the bushing is 5/8 of n inch and the metal wheel itself has a 5/8 of an inch diameter.
See the attached photos. The building has 178 units and a lot of the tenants are really in need of these replacement roller parts.
Any help would be appreciated.
Thank you, Jack
A customer submitted photo of a window frame roller.
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Paul from SWISCO responded:
April 18, 2012
Thank you for posting. Please take a look at our 87-141 Acorn sliding window roller. Do you think this could be a possible replacement?
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Donna from SWISCO responded:
April 18, 2012
Also, please see and compare your sample to SWISCO product code 87-061, Acorn Slider Roller Assembly.
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