An article carrier for a motor vehicle having a cross bar with a pair of end supports at each end, where each end support can be simultaneously locked or unlocked by lifting an actuating member of either end support. A principal advantage of the construction of the end supports is that the actuating member thereof can be urged between its locked and unlocked positions without protruding significantly from the end support, and therefore without requiring a significant degree of clearance between the end support and the outer body surface of the vehicle. Thus, the cross bar can be placed closer to the outer body surface of the vehicle while still allowing the actuating member of each end support to be articulated between its locked and unlocked positions.