Replacement channel balance?

Hey Kirk. You are correct that it sounds like you need to replace some of these channel balances. And yes, many of these do indeed look alike at first! The balance in your photos appears to be either an S351-31 or S390-31. The only difference between these two balances is the depth of the bottom nylon shoe, or the heel-to-toe measurement, so compare both with your old hardware to see what matches best. You'll need a stamp option of 3040.