Traco brand sliding window roller

A contractor says:
It is the left bottom corner

Looks like every corner ( bottom and top)
Has one.
It is a TRACO brand window. ( aluminum glass)
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Tom from SWISCO responded:

Thank you for your patience during this busy summer. We don't have this exact roller, but I believe that you can use our 81-248 as a replacement. Look it over and let me know if you agree.

81-248 : Traco Sliding Patio Roller, Flat
Traco Sliding Patio Roller, Flat
81-248
$13.11
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