SPROCKET, 29T #60 Chain. 1.10" ID x 7.43"OD. Has keyway, cross drilled and tapped. LOW PROFILE CORN HEADER - 1971 MODELS & PRIOR; LOW PROFILE QUICK SWITCH CORN HEADER - 1974 MODELS; LOW PROFILE QUICK SWITCH CORN HEADER - 1975 MODELS; ADAPTERS AND DRIVE CONVERSIONS F/CORN HEADER; 20" ROW SPACING CORN HEADER.