I really don't understand what you are asking, but the spring spacer itself is 3" tall and the spring seats into the spacer 1" so it makes the spring 2" taller. Actual difference seen in wheel well to top of tire will be more like 1&1/2" to 1&3/4". If you already have OEM 912 springs it will make your total lift 4" or so. OME 912 by themselves only gives you about 2 to 2&1/2" lift. So OME 912's + 2" spacer will give you 4" to 4&1/2". The problem you run into when doing this is pinion angle. That is why I got the adjustable lower links. Without the adjustable lower links your driveshaft will probably start to vibrate past 40mph.

Once again though when I had the smaller 33" tires on mine I had no problems with rubbing because I increased the size of my bump stops slightly. I did not loose any up travel in the wheel. See this picture: