fr. and rr. sway bars

Put front bar on first and see what happens. You may not need a rear bar for most driving. It also depends on many other factors. Springs, Wheels and tires, car balance, small block or big block, shocks, and some others that escape me at this time. Get the best front bar that you can. Best might mean better install kit or knowing what you must do to install in your type of car. Hellwig products have least install issues IMHO. Addco is lowest price, but will need some welding and other work for best install. Look for install pictures on cars like yours and read what others liked or dis-liked. I did install a front bar Addco on a 66 Barracuda with some welding. I have not driven it yet.