An electrical connector includes at least two parts: a housing having a mating side (MS) and a rear side (RS) and a terminal module having a mating side and a rear side. One part includes a mounting structure and the other part includes a corresponding receiving structure for receiving the mounting structure of the other part. The mounting structure extends in a direction from the mating side to the rear side of the part and includes a cross-section perpendicular to that direction, which cross-section has an asymmetric profile.