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Casey from SWISCO responded:
September 12, 2023
Hello, I can't be sure with your pivot shoe still installed but yours resembles either the 15-188 or 15-178 . I would recommend removing your part from the window to compare to the dimensions shown below.
![]() Alternate image for 15-188
![]() Dimensions for 15-178
As for your spiral balances, take a look at the 3/8" diameter S900 or 5/8" diameter S600 depending on the size of your original housing tube. Yours looks like it may be on the narrower side but it's important to measure to ensure that you purchase the correct replacements. Thank you! |