In all honesty you wont need cc plates with Sportline springs. You will need the camber adjusted 'slightly',.. but the caster and toe alignments should not need to be touched.
This is my wife old 96 Cobra. It had Eibach Pro springs on it when we first got it. We then changed to Sportlines which lowered the car and stiffened the ride even more than with the Pro springs. My wife loved it but I kept complaining about how stiff the ride was,.. so we swapped to H&R sport springs which were about the same ride height,.. maybe 1/4" lower than the Sportlines. We ran 17x9 wheel with 275/40 tires up front and 17x10.5 with 315/35 tires out back.
The car did not need CC plates. I did have a Steeda bump steer kit on the front,.. but it turned out the car was not experiencing bumpsteer. Rather it was the choice of wide wheels up front that liked to chase the grooves in the road. Modifying the caster helped with that problem,.. but created a stiffer steering feel as a result.
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And as you can see in this pic,.. there were no CC plates installed. The car handled like it was on rails. 100% better than my GT. My wife ran this car at Sebring, earned her solo license in it and did a few auto-x courses here and there with it.
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Swapping springs is very easy to do. If you need some pointers to making it easier to do just ask.
Hurst