I installed the springs I purchased of fleabay over the weekend, they fit perfect and the back is perfect, so no need to mess with anything, I would say, these would be odd in the Cruze if it was to sit 20 to 25mm higher in the front, the rear springs actually came with a 10mm rubber packer but I left that out, I have about 25mm clearance from tyre height to guard, this will diminish as the springs bed in over time.
Ride is awesome, the progressive rate on springs are a tad softer on cruising but when you take hard corners or hit bumps/dips, the springs feel much stiffer, far less body roll.
My model has gas shocks fitted, not sure if this is common on all the American trim levels, but we only had one level, so I'm guessing all Aussie models will be the same, if any of the shocks end up warn, I will most likely go with Cruze after market cheap gas shocks as well.
I will take some pics later and put them up, I also noticed that I have around 2k more range now as well, but I will know more after a week of driving.