1/2" top sash guide

A home owner from San Jose, CA says:
I need the size in the middle that does not overhang You sent me the larger ones on each side. They overhang on the ends and the sides, and will not fit. I'm a previous customer who has purchased channel balances and 1/2" top sash guides before (18-036).
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Emily from SWISCO responded:

Thank you for reaching out to us. I can't say for sure without dimensions but our 18-166 looks similar. I recommend you review our specifications and compare them with your old hardware to see how they match up. 

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