I have four nubs in front. when I bought them I actually did not understand the system and got original MB rubber. It seemed like a good idea with my new original MB coil springs. Now my front gap is approaching "rock crawler" territory and we will be cutting the coil soon (I have been trying to do this for some time, but "life is what happens when you are busy making other plans"--John Lennon). Then we will see what nubs seem appropriate for me.