Casey from SWISCO responded:
September 9, 2015
Hi Paul, this looks similar to SWISCO product code 87-193, 1/2" diameter roller with axle pin. Carefully compare the measurements and let us know if they differ in any way. Sometimes the same rollers are used in the top of the window sash as well; it may help keep the window rolling smoothly within the frame/track. You could try just replacing the lower rollers and see if it glides smoothly.
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Paul from SWISCO responded:
September 15, 2015
The 87-193 roller has a wheel that is 1/2" in diameter and 3/16" thick. The nylon pin is 9/16" long by 5/32". It's not exactly the same as your dimensions but it's close. I'm honestly not sure if it will work for you, but it remains our best match.
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