Abstract: A horizontally elongated and laterally opening shroud is provided having one open longitudinal front side and one closed longitudinal rear side as well as opposite end mounting structures at least substantially closing the opposite ends of the shroud. A pair of spiral bladed rotary conveyor members are journalled in the opposite end portions of the shroud for simultaneous rotation about an axis extending longitudinally of the shroud and the closed rear side of the shroud includes a lateral outlet centrally intermediate the mounting structures and with which the horizontal axial inlet of a snow blower including an upwardly opening tangential outlet is registered. The opposite ends of the shroud include vertically adjustable transverse skids and the conveyor members are driven by a fluid motor supported from one of the mounting structures.