Thanks for reaching out. Your channel balance appears to be an older version of our cross-bow style channel balances. It is designed similarly to our Series 795 Channel Balances and it looks like they are 23" in length. So you'll need the S795-23 To select the correct stamp option, you'll need to obtain the weight of your sash. Then use that weight to select your stamp based on the weight ranges on the chart below the product description.
This balance it comes equipped with a screw clip on the top of the balance as well as a 1-1/4" T-Lock Balance shoe. So, you'll need the 26-200 screw plug to install the balance to the window.
Also, please confirm that the diameter of your balances is 1/2". If they are not, then we'll need to take a look at another solution. Although, I am confident this is what you'll need.
My sincerest apologies the 23" measurement I wrote in my previous post was a typo and I did mean to suggest the 22" Balances. That being said, you'll need the S795-22 with a 22B stamp for a 13lb window. These balances come equipped with a screw clip on the top of the balance and comes equipped with the 15-195, 1-1/4" T-Lock Balance Shoe.
To identify the other balance for the upper sash, you'll need to obtain the same information from those balances to determine the correct replacements. Which means you'll need to remove them from the window.
Then, as detailed above, to select the correct stamp option, you'll need to use the weight of your sash and compare them weight ranges on the chart below the product description for the balance.
You'll need to use the website to purchase these balances once you've confirmed all of the correct information. If you need assistance with placing the order, you may call (888) 991-1929 to speak with a member of customer service.
