Kevin, the piece i speak of, is called the "fork race", it goes under your lower bearing between the fork and the bearing. Its the piece that slides over the fork before you put it through the headtube. The lower bearing would rest on it once assembled.
Nikita- Ok, i may be talking about another part then. there sometimes is a thin ring, usually plastic that goes around the edge of the part i mentioned above, to keep the dirt out.BUT if thats not what your talking about,then it may be the race like i originally thought.
The one in the Fuel integrated is silver. Its flat, with a slight cone shape to the middle of it. the hole is the same size as a spacer for your stem.
The plastic dust cover, which i dont recall the Fuel integrated having, would be a much larger hole and a thin ring.