I would absolutely install a pair of bars on the car as soon as you can. Although just adding a front bar again would make it less sketchy to drive, it takes a pair of bars to restore the "proper" balance in handling behavior.
It would probably be cheapest to get a pair from a salvage yard.
I have a pair of Eibach bars on my car and noticed a difference when I installed them onto my stock Bullitt.
The car will drive MUCH better with bars on it. You won't regret a little investment in getting bars back on your car!
HiTech stageII cams, BBK Ceramic LongTubes, MAC ProChamber, Flowmaster50series, SteedaUDP, JLT CAI, MGW, SVT Focus Fuel Pump, H&R Race springs, Bilstein HD, MM CC Plates, MM FLSFC, Eibach Swaybars, MM LCA, MM Pan-hard, 3.91gears, AuburnPro diff, Moser31splines, 17x9 & 17x10.5 Bullitts, Dark smoked headlights w/ 55W HID, chin spoiler. 283rwhp/298torque (motor), 417rwhp/498torque (latest nitrous tune) firstname.lastname@example.org (motor w/ 1.77 60'), email@example.com (1.78 60')on nitrous.