A support part serves is arranged in an instrument panel of a motor vehicle to hold a vehicle data display unit having an integrated navigation or radio unit. The support part has a single-piece frame composed of a magnesium pressure die cast material with a central holding frame for the unit and lateral holding frames for the air outlets. The support part is connected at one side to the instrument panel and another side to the cockpit cross member. Centering receptacles for the unit and further centering receptacles for the air outlets are arranged in the central holding frame and in the two lateral holding frames. Centering elements are arranged on the unit and on the air outlet correspondingly to the centering receptacles of the holding frames.