such as shown in fig6 a single unitary crop flow assistance device similar to 11 could be manufactured which was of the desired length to extend from one extreme end of the conveyor deck 2 on a harvesting header 1 to which it was to be attached either to the center discharge or to the extreme opposite end of the conveyor deck 2 in the case of this type of a unitary crop flow assistance device this might be most desirable if it was manufactured for only in installation on the new harvesting header however both in order to accommodate particular installation configurations on harvesting headers of different manufacturers as well as for the purpose of installation of the crop flow assistance devices 11 to the present invention on harvesting headers of various widths it is contemplated that in other circumstances of modular completed crop flow assistance devices 11 might be assembled a plurality of crop flow assistance devices 11 could be assembled as a modular unit onto a harvesting header by mounting them adjacent to each other along the rear wall 3 of a header 1 by mounting a plurality of crop flow assistance devices 11 each manufacturer in accordance with the remainder of the present invention adjacent to each other along the rear wall of the harvesting header a completed interior crop material surface could be created for the rolling deflection of crop material back into the crop material transporter as it was moved by the transfer conveyor or conveyors to.