Top Sash Channel Balance Guides

A home owner from Mission Viejo, CA says:
I am having trouble matching up this part. Please help.
User submitted photo of their top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
This is a peculiar top sash guide. Your width is shown to be 1/2", which limits us to the 18-180. At first I thought this might be our 18-009, but that is only 5/8" wide. Please review.
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