Jasmine from SWISCO responded:
April 3, 2024
Thanks for writing in! Given the confirmed dimensions, you'll need the S900-29 Spiral Balance. Since the sash weighs 17.2lbs, I suggest using the red tip option. Your pivot shoe appears to be the 15-045 3/8" Thick Pivot Shoe. I am confident this is the replacement shoe you need but be sure to confirm the dimensions below. Dimensions for 15-045
The two pivot bars most commonly used with this shoe are the 26-041 2" Keller Pivot Bar and the 26-297 2-1/4" Pivot Bar. Take a look over the dimensions and design of each of them. If neither of them are a match, I'll need to see a photo of your existing pivot bar removed from the bottom of the sash. Alternate image for 26-041
Alternate image for 26-297
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