Casey from SWISCO responded:
April 18, 2024
Hello, It looks like you have an old-style version of the 15-180 Pivot Shoe, which uses Series 190 Coil Balances. You are correct that if your coil spring is stamped with 6, S190-640 would be the corresponding replacement. We also offer the 15-181 double support for these coil springs. Take a look and let us know if you have any other questions. Alternate image for 15-180
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