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Hi there!

Thank you for reaching out to us. Take a look at the Series 380 and Series 385 channel balances. The important difference is the depth of the bottom shoe, so you'll have to measure as shown below to confirm the best pick. You'll also have to refer to the stamp printed on the back of the metal channel to determine the strength option for the replacements.

Please let us know if you have any questions.

Comparison of the S378, S380 and S385 balance shoes.

You'll want the 1520 stamp option based on this photo. A pair of S380-16 balances with this stamp will support a sash weighing 6 to 10 pounds.