We have 24 rows of Gen 1, 360 chainroll knife rollers still in the boxes. We ordered them before 2018 harvest, they arrived mid-harvest and didn’t fit and won’t fit our early serial model header. Compatible with: 8 row serial model 740473 and after 12 row serial model 740749 and after They have the cross pattern on the inside (see pic) and one knife per roll. Retail $990/rowAsking $600/row must take allCall 78five-8Five0-0four7four for more infoNO SPAM