Sickle Knifehead fits Case IH 1190 4000 5000 824594C91 fits New Idea 509 901-042
Compatible with Case IH Hay Cutting(s) 1190, 4000, 5000. Replaces Case IH OEM Number(s) 824594C91, 824812C94 (WITHOUT STEP). Compatible with New Idea Hay Cutting(s) 507, 509, 5107, 5109. Replaces New Idea OEM Number(s) 901-042.