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Hello,

I don't recognize this top sash guide at first glance but I'm going to have one of our senior experts take a look and see if they could recommend a replacement for you. We'll reach out as soon as more information is available. Thank you!

Even though it doesn't have a top cap, we believe the 18-109 would be our best replacement option for your top sash guide. Please review the dimensions shown on our product page to see if this would work for your repair.