A stabilization assembly for stabilizing a vertebra or other bone includes: at least two rods having different diameters; an anchoring element having a shaft and a head; a receiving part for interchangeably receiving any one of the rods to connect the rod to the anchoring element, the receiving part including a rod receiving portion with a channel for receiving the rod, and a head receiving portion having an open end and being flexible to allow introduction and clamping of the head; and a locking ring configured to be arranged around the head receiving portion and to clamp the head in the head receiving portion; wherein the locking ring includes a contact surface configured to contact any one of the at least two rods at at least two distinct contact areas that are spaced apart from one another in a circumferential direction of the rod.