An electrical connector receptacle housing is provided that includes protrusions in the housing's contact assembly receiving area. The location of each protrusion corresponds to a location of a well formed in a contact assembly between dual beams of ground contacts. When the contact block is received in the housing, each protrusion is received in a corresponding well. The protrusions may be sized to provide a snug fit as the contact block is received in the receptacle housing. The protrusions thus help minimize the movement of the contact block.