Assuming an ML320 is part of the Mercedes-Benz M-class range that is fitted with roof railings as standard. To mount a roof box with the fittings supplied with it, a railings carrier for normal-sized roof railings and a roof bar are needed such as the Thule Rapid System 757 and the Thule Aero Bar 869. Visit the Thule fit guide on
www.thule.com/en-GB/GB/FitGuide.asp... entering the vehicle details to determine what is needed
answered 1 year, 6 months ago