I am looking for channel balancers ID #21C. I could not find the correct one on your web site that match up to the one I have, and this is why I am contacting you for help. I am sending pictures of the type I have, hope they will help.
The channel is 22" long and connects to the window frame at the top with a (S) hook and the cord is attached at the bottom in a plastic bracket. The window sash is 14.9 lbs. The (S) clip is 2" and there is a length of cord that extends 6" below the channel.
I hope this will give you enough information to be able to help us with the correct one to buy.