I can tell you it doesn’t appear that a Hotchkis 22385 sway bar is going to fit a 66 Barracuda without fab work. It’s close but not direct fit.
Their web site shows it as an option when you shop by vehicle but it does say 67-72. Looks to be a little wide as mentioned above. I have read here on FABO that the Firm Feel sway bar may cause interference due to it mounting outside the strut rod to the lower shock mount hole. Also if you want a hollow bar Firm Feel is not making them right now due to material problems. I just ordered some parts from them and was talking to them about buying a hollow bar.
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