Channel balance 27D24 replacement

Thanks for reaching out to us! We should be able to help with this but we will need more information to do so. Can you show us some photos of the top fitting? 

It does, thank you! I recommend either the S351-28 or S390-28 depending on the depth of the bottom fitting. You will have to measure as shown below. As for what strength option to select, I'd recommend 2740. A pair of balances with this stamp will carry a sash weighing 19 to 26 pounds.

Comparison of the S351 and S390 balance shoes.

You don't want to measure the way you show in your second photo. What you want is to measure "heel to toe" as shown in the diagram above. 

Thanks! Looking at these photos I feel confident that you have the larger S390-28 , which has a 1-1/8" deep shoe.

Please feel to reach out if you had any other questions.