i have a used steeda adjustable rear sway bar for solid axle. it fits all 79-04 mustangs with solid rear axle. this is a add on to your existing sway bar to stiffin up the rear. i went irs so no need for this. 129 plus shipping new, selling for 50 plus shipping. below is a link to it on the steeda site:beer:
Steeda Adjustable Rear Swaybars for 1979 thru 2004 Ford Mustang 006-470 006-1STA
Steeda Adjustable Rear Swaybars for 1979 thru 2004 Ford Mustang 006-470 006-1STA