Abstract: A mounting system for connecting an upper body structure of a motor vehicle to a vehicle platform of the motor vehicle includes a hollow pillar element arranged lengthwise along a vertical vehicle axis; a fastening bracket laterally embracing a lower end portion of the hollow pillar element and including fastening interfaces for affixing the fastening bracket to the hollow pillar element at the lower end; a hollow clip-on connector arranged laterally along a longitudinal vehicle axis, the hollow clip-on connector defining a mounting platform including a horizontal resting surface for the hollow pillar element to be arranged thereupon at its lower end portion together with the fastening bracket and a vertical mating surface for abutting a corresponding mating surface of the fastening bracket; and a hollow side sill element arranged lengthwise along the longitudinal vehicle axis.