Roller assembly on bottom of a slider winding

A handy person from Shingle Springs, CA says:
June 17, 2020
Need 40 of these. Two per window
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Dave Sr. from SWISCO responded:
June 22, 2020

Hey there, thanks for posting. Please look at our 87-180 roller. This might be the one you are looking for. See if it matches up to your original in terms of size.
Merzon Sliding Window Roller, 3/8" Concave Wheels
Merzon Sliding Window Roller, 3/8" Concave Wheels
87-180
$4.37
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