A row unit for a header of an agricultural harvester is provided that includes a first longitudinally extending stripping plate and a second longitudinally extending stripping plate each mounted on a frame and each having opposed stripping edges which define a gap between the first stripping plate and the second stripping plate. The row unit includes a gap adjustment mechanism for adjusting a size of the gap that includes first and second linkage assemblies. Each of the two linkage assemblies have an elongated linkage extending substantially parallel to the respective longitudinally extending stripping plate, and a connection mechanism connecting the elongated linkage to the longitudinally extending stripping plate. The row unit further includes a control arm connected to the first and second linkage assemblies for moving the first and second linkage assemblies between first and second positions.