Need Correct window sash guide

A home owner says:
I need window sash guide as shown. What product is the right one?
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Paul from SWISCO responded:

It's hard to tell what can work with your top sash guide is still installed. Start with taking a look at our 18-018. You will need to compare the measurements of your part with ours. If this isn't a match, you will need to remove the part and upload photos, with the measurements you need. for us to review.

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