SWAY bar from 67-72
The front of the early A bodies is not as wide as the 67-72 so the bar will not fit but the did have swaybars on the 66 formula S barracudas so if you can find the bar will work. The other option is to have one made. Check Firm Feel to see if the make one for your application (
www.firmfeel.com). I know this because I have a friend with multiple 64-66 barracudas and has one with a swaybar.