Having difficulty locating these balances with the top and bottom. The metal part of one balance measures 24 7/16 stamped 2430. The other metal part balance measures 18 1/2" and is stamped 1820. The sash guide pics show the different dimensions Second of two pics.
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Casey from SWISCO responded:
March 29, 2022
Hello, Your top sash guide resembles the 18-110. Take a look and see how the specifications listed on our product page compare to yours. As for your balances, I suspect you have either our S351, with a 15-002 bottom attachment, or S390, with a 15-001 bottom attachment. Please note that a balance with a 2430 stamp will normally have a 25" mental channel and 1820 would normally be 19" long, not including the end attachments. Take a look at the image below to determine which balance you'll need. Thank you! 
Comparison of the S351 and S390 balance shoes.
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![How to Replace a Top Sash Guide [1080p]](../../images/videoThumbnails/107.jpg)
