The spring pads / rubber collars come in four thicknesses for the front and three for the rear. You can identify your car's pad thickness by looking very carefully around the edges. You will see a series of little "bumps". The bumps or numbs correspond to the thickness of the pad.
I my opinion a properly setup car will have a slightly higher rear than front. This is because the front ride height doesn't change but the rear does. You drive the car fully unloaded and all the way to fully loaded: 5 passengers and a trunk full of luggage.
I have seen measurements elsewhere on this site using the rubber jack points under the car, right behind the from wheels and just ahead of the rear wheels of abut 7.5".
Hope this helps.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)