Bob from SWISCO responded:
June 18, 2023
Thanks for posting. Unfortunately sliding window hardware is getting harder to come by, as it just isn't really made any longer. This roller body is not available, but we may indeed be able to help you replace the wheel. See our 87-058, which has a 9/16" diameter, as well as the 87-193 with a 1/2" diameter. Compare the diagrams below with your old wheel and see if you think one of these could work for you. Profile view of 87-058
Side view of 87-058
Alternate image for 87-193
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