Spiral balancer
Thanks for reaching out to us. Looking at your photos, your balance has a black tip color option. The problem is that no 3/8" balance was ever made with that tip. I highly recommend that you double check the diameter of the outer tube to ensure that it's not 9/16", instead. You need to measure it as carefully as possible; that's unfortunately not something I can judge from a photo of a tape measure. You should do this for each balance in question.
Assuming that it is 9/16" then you would simply go with the S600-29 with the black tip weight option.
Hello,
We do not have your exact pivot shoe, but please review the 15-212 or 15-134 pivot shoes to see how they compare to your original. Please note that the 15-212 has a cam opening that is 5/16" by 3/16" and the 15-134 has a 1/4" wide by 3/16" high opening that accepts the pivot bar.
For the spiral balances, you will want to go based on the weight of the window sash to choose the correct color tip option.
Even though the 26" balance has a 9 pound sash weight, the red tip should not give you an issue.
For the 29" , 25.5 window sash, either the green or yellow tip should work for the window since the range falls into both.
Please review and let us know if you have any additional questions.