1316161C93 Sickle Knife Head Fits Case IH 1010 1020 HeaderOne New Aftermarket Replacement Sickle Knife Head Fits Case IH (Fits Case International Harvester) Grain Headers This aftermarket replacement sickle knife head Fits Case IH (Fits Case International Harvester) 1010 and 1020 grain platform headers equipped with a 3 inch cut cutter bar system. The knife head is the critical drive connection point at the sickle bar that converts rotary motion into the reciprocating cutting action of the sickle blades.