A concave for a harvester combine is provided, the concave comprising a first longitudinal member comprising a plurality of first longitudinal member wire guide grooves substantially at the same height position relative to a bottom of the first longitudinal member; a second longitudinal member comprising a plurality of second longitudinal member wire guide grooves substantially at the same height position relative to a bottom of the second longitudinal member; a first transverse member and a second transverse member substantially parallel to one another affixed to the first longitudinal member and the second longitudinal member; and a plurality of module members affixed to the first and second transverse members.