Abstract: A vehicle seat is provided having a seat frame and a backrest frame made of a light metal diecast material which are swivellably connected with one another by means of seat fittings. For providing a vehicle seat which, in the manner of a building block system, can be upgraded by means of standardized supplementary parts from a simple seat for the lower price class to an integral seat of the upper price class with clear cost advantages with respect to its manufacturing, the backrest side members are constructed to be open toward the outside and have a surrounding edge profile on which fastening elements for the common fastening of the backrest-frame-side fitting parts of the seat fittings and of modules are arranged which carry operating parts, such as backrest adjusting devices, an armrest, a seat belt, a side bag, etc. In this case, the backrest-side fitting parts and the modules are accommodated in a form-locking manner in the edge profile.

Abstract: Before mounting a rear seat of a motor vehicle, a wedge-shaped mounting aid is placed on two adjacent belt buckles. The mounting aid engages with its tongues in the belt buckles and is therefore held in the same manner as the belt tongues of the usual safety belts. Since the mounting aid tapers toward the seat, it slips, together with the belt buckles, easily through the slit provided for this purpose in the seat.