Aftermarket Series 4 metric Implement Yoke with 1-1/2" Bore and a 3/8" Key Slot.
Holes for 27mm (1.06") bearing caps with retaining ring grooves 74.6mm (2.93") apart.
a 1-1/2" smooth bore with a 3/8" key slot and a set screw that is 90 degrees off the key slot