The factory sway bars aren’t particularly “heavy duty”. If that’s what you’re after you’ll probably want an aftermarket sway bar.
For the 67-72 cars the aftermarket sway bar mounting tabs on the LCA’s are in different spots than the factory tabs. The hotchkis bar uses a different location than the factory did, I think that Hellwig makes one bar that uses the factory tabs and one that uses a custom location. The factory sway bar design and tab location limits front tire width, so some of the aftermarket bars address that.
Bergman Autocraft also sells a set of weld on tabs, they look pretty good. Just be aware that welding them on in the factory location to use a factory bar may limit your aftermarket sway bar choices later.
