A row unit (22, 122, 222) for a header of an agricultural harvester comprising a frame comprising a top surface; a first longitudinally extending stripping plate (36a, 136a, 236a) and a second longitudinally extending stripping plate (36b, 136b, 236b) each mounted on the frame, and defining a gap (28, 128, 228) between the first stripping plate and the second stripping plate, characterized by: a gap adjustment mechanism (40, 140, 240) for adjusting a size of the gap that includes: a first linkage assembly (42a, 142a, 242a) having: a first elongated linkage (46a, 146a, 246a) extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism (44a, 144a, 244a) connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly (42b, 142b, 242b) having: a second elongated linkage (46b, 146b, 246b) extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism (44b, 144b, 244b) connecting the second elongated linkage to the second longitudinally extending stripping plate; and a control arm (50, 150, 250) 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 (46a, 146a, 246a), the first connection mechanism (44a, 144a, 244a), the second elongated linkage (46b, 146b, 246b) and the second connection mechanism (44b, 144b, 244b) are adjacent to and mounted on the top surface of the frame. a gap adjustment mechanism (40, 140, 240) for adjusting a size of the gap that includes: a first linkage assembly (42a, 142a, 242a) having: a first elongated linkage (46a, 146a, 246a) extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism (44a, 144a, 244a) connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly (42b, 142b, 242b) having: a second elongated linkage (46b, 146b, 246b) extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism (44b, 144b, 244b) connecting the second elongated linkage to the second longitudinally extending stripping plate; and a first linkage assembly (42a, 142a, 242a) having: a first elongated linkage (46a, 146a, 246a) extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism (44a, 144a, 244a) connecting the first elongated linkage to the first longitudinally extending stripping plate, and a first elongated linkage (46a, 146a, 246a) extending substantially parallel to the first longitudinally extending stripping plate, and a first connection mechanism (44a, 144a, 244a) connecting the first elongated linkage to the first longitudinally extending stripping plate, and a second linkage assembly (42b, 142b, 242b) having: a second elongated linkage (46b, 146b, 246b) extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism (44b, 144b, 244b) connecting the second elongated linkage to the second longitudinally extending stripping plate; and a second elongated linkage (46b, 146b, 246b) extending substantially parallel to the second longitudinally extending stripping plate, and a second connection mechanism (44b, 144b, 244b) connecting the second elongated linkage to the second longitudinally extending stripping plate; and a control arm (50, 150, 250) 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 (46a, 146a, 246a), the first connection mechanism (44a, 144a, 244a), the second elongated linkage (46b, 146b, 246b) and the second connection mechanism (44b, 144b, 244b) are adjacent to and mounted on the top surface of the frame.