Tom from SWISCO responded:
June 30, 2015
I'm sorry, I'm a little confused. Are you looking for a top sash guide or a roller? If you need a top sash guide, I won't be able to find what you need by referencing the 87-177, as it is an unrelated part. In either event, please show us a few pictures of the part in question removed from the window. Please also give us detailed dimensions. Thank you!
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