2820 balance

Hi there!

It appears you have either our S351-29 or S390-29 channel balance. These two parts may look the same but the only difference is the depth of the bottom fitting. The Series 351 has a 1" deep shoe and the Series 390 has a 1-1/8" deep shoe. You'll need to measure as shown in the image below to see which one matches your original. You will also need to choose the 2820 spring strength option. 

Comparison of the S351 and S390 balance shoes.