A heat exchanger for a motor vehicle, in particular a coolant/air cooler (2'), is designed to be fastened to a lower support and an upper transverse support in the motor vehicle by means of upper and lower fastening elements. The heat exchanger (2') has at least one plastic collecting tank (6', 7') onto which the fastening elements can be injection molded. The fastening elements (10', 11', 12', 13') can be produced with different positions and/or different dimensions, e.g., two positions and/or two dimensions. An injection molding die having interchangeable inserts is preferably employed to produce a series of header tanks differing only in the positions and/or dimensions of the fastening elements.