The aftermarket kits are almost a bolt on . I 2nd that they make a night & day difference .
I believe I got mine here

https://www.classicparts.com/mobile/1955-59-Anti-Sway-Bar/productinfo/74-804/
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1959 3100, original 235/3 on the tree w/overdrive. Carter YF 2100S carb, 205/75/15 w/front sway bar