A mounting arrangement for an add-on part or charging socket on a carrier structure or vehicle body of a two-track vehicle, includes an assembly tool feeding the add-on part in a feed process step into the carrier structure in a direction of a final mounting position. The add-on part is attachable to the carrier structure at an attachment point. The mounting arrangement has an auxiliary mounting holder in the carrier structure to simplify mounting. In the feed process step, the assembly tool moves the add-on part into a premounting position, for transferring the add-on part from the assembly tool to the auxiliary mounting holder, for restoring the assembly tool without the add-on part in a reversing direction opposite the feed direction. The auxiliary mounting holder has a transverse guide, along which the add-on part is adjustable from premounting to final mounting position.