Top sash guide

A handy person from Tampa, FL says:
January 25, 2021
None of the sash guides I see appear to correspond with what I have (replacing spiral balancers S305-23). The closest guide is 18-034. However, the dimension of the width indicates is 1/2", but my existing sash guides are only 7/16" wide. all other dimensions on that part appear correct except the width. 0Can you advise of the correct sash guide? Thank you.
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Bob from SWISCO responded:
January 27, 2021

I do believe the 18-034 is our closest match. It's possible you might need to modify the guide for your application, a process you can read about in greater detail here, but I'm honestly not sure if that will apply in your case. Take a look and see what you think. 
Top Sash Guide
Top Sash Guide
18-034
$2.87
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