Ford Racing Lowering N Springs

Ive been looking for a set of springs that is optimized for the V6 and have yet to find any. The problem is that while all of them lower the ride height, all of them also have a higher spring rate, which means that they won't able to work with the stock shocks (the rebound dampening is wrong).
I like the ride the way it is and don't want he rate to be changed.
I did shorten my stock rear springs and they are still working well while giving me the stance I want. However if I could find a set of shorter rear springs that had a stock rate I would buy them.
I lowered the rear approximately 1.5 inches, and although the fender gap is slightly different side to side, the axle seems to still be close enough to center.

To be thorough, you should look at springs, dampers, and an adjustable panhard bar. Many people have used lowering springs with stock dampers, but you may not be happy with the ride quality. If you do lower the car, then your rear axle MAY need to be re-centered with a panhard bar. You can always do the drop, then measure where your rear end is, and decide.

There are a ton of threads on this stuff, read a bit on the S197 forums and you'll get good info on what to expect from various mods.