Some wheels are hub-centric others are lug-centric. I would suspect your wheels are lug-centric as you do not have the hub-centering pieces.

Mine are very small black plastic rings that fit into the back side of the wheel. Double check to see if you have the small ring inside your wheel by pulling it off.

Money doesn't always bring happiness. People with ten million dollars are no happier than people with nine million dollars ~ Hobart Brown