Don't buy just the rear bar! The front bar is significantly larger on cars with the rear bar and that balance is needed- unless you are building a drift car...lol. Remember that when you increase the roll stiffness of one end of the car you make that end do more of the steering. Just doing the rear bar makes it more likely to go into tail-out snap oversteer. That's why you want to balance it with the matching front bar.Understeer is easier for most people to control than oversteer. Consider switching to a set of polyurethane suspension bushings while you are in there too as well as new ball joints and tie rod ends.Check the steering coupler to be sure it is not work and loose, and consider switching to the fast ratio steering box out of an F-41 car too. While you are down there, consider replacing all three brake hoses as well since they are likely dry rotted and internally swollen. This is a 20+ year old car and it is important for the sake of safety to be sure all of these systems are working 100%.