Channel balance 2890 40

Thanks for posting. It appears the top nylon attachment has 'wings', or side tabs, while the bottom attachment does not. Is that correct? If so, see our S395-29 Channel Balance. You also have to choose a stamp option, which denotes the strength of the balance. Your old balance's stamp of 2890 is from a rating system not in use. To know what stamp code you need, weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description on the S395-29 store page. Let me know if you have further questions. 

Thanks! With a sash weight of 23.3 pounds, you can use the 2840 stamp. Two balances with this stamp can carry 23 through 28 pounds, so that should be perfect.

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