A draper header is attached to a harvesting machine by an adapter including a bottom feed draper and an upper feed roller driven by a coupling from an output of the machine rotatable about an axis parallel to the forward direction and a right angle gearbox. The feed roller is mounted at each end allowing independent up and down floating movement of the ends and there is provided a mechanical linkage using two chains and an idler shaft between the output shaft of the gear box an input shaft of the roller with a universal coupling therebetween. The gear box is located at least partly underneath the discharge opening and underneath the feed roller, rearwardly of the rear guide roller of the feed draper, rearwardly of the axis of rotation of the feed roller and underneath a feed pan which is inclined upwardly and rearwardly over the gear box.