... DRIVESHAFT assembly:Varieties hole, pin fork, break tank, 6 tooth, 20 tooth, 21 tooth spline forkTriangle shaped tube, lemon tube, pipe welding fork ... 6 Splined (540) on the Tractor End1-3/8" Smooth with 1/2" Shearpin Hole on the Cutter EndMinimum Working Length ... couplers(adapters) (FAS). 7 For any other more special requirements with plastic guard, connection method, color of painting, package, etc., ...