A pre-assembly set for a car has at least one first subsystem facing the cabin with a first carrier structure, at least one second subsystem with a second carrier structure assigned to an aggregate chamber and functional units which are assigned to one or both subsystems. The carrier structures and/or their functional units are joined by coupling elements. There is a one-part or multi-part transverse wall separating the aggregate chamber from the cabin which is joined at least with sections of the first and/or second carrier structure. The functional units comprise windshield wipers and headlamps. The carrier structures are made from plastic mouldings.
