Are the XR-7 springs the same spec as the Supercoupe? As far as stiffness goes. I'm looking for a set to upgrade the stockers on my 97. I considered buying Eibach's or Vogtland, but from what I hear the SC springs are a good bit stiffer. If the XR-7 Springs are the same that would be perfect as there are quite a bit more cougars than thunderbirds at the local yard. Thanks!
97 Thunderbird LX 4.6L
PI Intake Manifold, Comp XE268's, 180 degree T-stat, Brother's Performance U/D pulleys, K&N filter w custom CAI, 75mm TB and Trick Flow plenum, Borla mufflers w Magnaflow tips, Magnaflow straight cats, Summit 8mm wires, Eibach Pro Kit Springs, Koni Adjustable Front Shocks, Bilstein Cobra Rear Shocks, Cobra R replica rims(17x9)front (17x10.5)rear