thanks not sure my production date....but mine a 318 rallye....front sway and not rear sway, unless some one over the years took it off?? and not sure the maesurement of my torsions bars....i see alot of talk about changeing them out.....mine might have been since i bought the car with a 440 in it?...not sure ill have to get a micormeter i guess and measure...i see alot of diff sizes posted on here