The 65/66 Dart/Valiant/Barracuda sway bar(if equipped) is the only factory bolt-in as long as you have the LCAs with the correct sway bar tabs. The factory sway bar is a hard animal to find as not all that many cars were equipped with them. Helwig offers an aftermarket bar that does require minor drilling of the K Frame to install and is much more beefier than the stock bar.
