A-AH220096-A-AI Drive Shaft, Countour Master HeaderOne New Aftermarket Replacement Drive Shaft Fits John Deere Contour Master Headers This aftermarket replacement Contour Master Header drive shaft (PTO driveline) transfers power from the combine to Fits John Deere grain headers, draper platforms, and corn heads. It is a Walterscheid W2400 series driveshaft featuring a 1 3 8" 21 spline slide collar on the tractor end and a 1 1 8" hex clamp on the implement end. Note: It may be necessary to cut this