Nylon roller in sliding aluminum window

A quick learner from Dayton says:
September 29, 2017
Hi, I believe the windows are original to the condo built in 1973. I need to source these rollers - one in each corner of the sliding portion. They're all the same, just positioned differently. The length is 1-1/8", width 13/32", and height including roller guard is 15/32". There is a screw hole with a squareashouldered countersink for a pan head screw.

I could not locate a manufacturer but the aluminum in the windows pane in stamped with PCO - 72 - 2. Probably the manufacturing date.
User submitted photos of a window roller.
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Tom from SWISCO responded:
October 6, 2017
Thanks for contacting us! We don't have this exact roller, but we are working on bringing in something that may replace it. Please give us a little time as we have it made for you, and I'll let you know when it becomes available.
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Casey from SWISCO responded:
October 11, 2017
Please see and compare our newly added part 87-228, Sliding Window Roller.
Sliding Roller Assembly, Flat Edge Wheel
Sliding Roller Assembly, Flat Edge Wheel
87-228
$4.28
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