Casey from SWISCO responded:
April 22, 2024
Hello, We can't be sure with the hardware still installed but it looks like you may have an old-style version of the 15-180 Pivot Shoe, which uses Series 190 Coil Balances. We also offer the 15-186 support for these coil springs. Take a look at the specifications and related items shown on our product pages to compare to your original hardware. Thanks for posting! Alternate image for 15-180
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