An assembly for an electrode connection device of an implant has a continuous receiving unit for a plug, a first connecting element which is arranged in a front region of the receiving unit and has at least two flat lateral surfaces, and a second connecting element, which is arranged in a rear region of the receiving unit. The second connecting element includes at least two flat lateral surfaces. Furthermore, an electrode connection device, an implant, and a method for mounting an electrode connection device all utilize the assembly.
