A row unit for a header of an agricultural harvester comprising a frame comprising a top surface; a first longitudinally extending stripping plate and a second longitudinally extending stripping plate each mounted on the frame , and defining a gap between the first stripping plate and the second stripping plate, characterized by : a gap adjustment mechanism for adjusting a size of the gap that includes: a first linkage assembly having: a first elongated linkage extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly having: a second elongated linkage extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism connecting the second elongated linkage to the second longitudinally extending stripping plate; and a control arm operatively connected to the first and second linkage assemblies for moving the first and second linkage assemblies between first and second positions; characterized in that the first elongate linkage , the first connection mechanism , the second elongated linkage and the second connection mechanism are adjacent to and mounted on the top surface of the frame . a gap adjustment mechanism for adjusting a size of the gap that includes: a first linkage assembly having: a first elongated linkage extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly having: a second elongated linkage extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism connecting the second elongated linkage to the second longitudinally extending stripping plate; and a first linkage assembly having: a first elongated linkage extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism connecting the first elongated linkage to the first longitudinally extending stripping plate, and a first elongated linkage extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly having: a second elongated linkage extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism connecting the second elongated linkage to the second longitudinally extending stripping plate; and a second elongated linkage extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism connecting the second elongated linkage to the second longitudinally extending stripping plate; and a control arm operatively connected to the first and second linkage assemblies for moving the first and second linkage assemblies between first and second positions; characterized in that the first elongate linkage , the first connection mechanism , the second elongated linkage and the second connection mechanism are adjacent to and mounted on the top surface of the frame . <EOS>