New Old Stock PTO Shaft Implement Yoke, 1-1/4 Round, 800-3520, FREE SHIP The gear is 6-3/8" inch

The gear is 6-3/8" inch in diameter

Case IH Sickle Bar Head part number  MA999

The early model Cubs had the rod and brake band made together as shown

Replaces John Deere and aftermarket landside part numbers:  JD25146AC

This bearing is also referred to as the "BULL PINION AND BRAKE SHAFT BALL BEARING" in some IH Parts Catalogs

New Old Stock PTO Shaft Implement Yoke, 1-1/4 Round, 800-3520, FREE SHIP The gear is 6-3/8" inchNew Old Stock PTO Shaft Implement End Yoke 1 1 4" Round Bore. Fits North American 35 Series PTO. Weasler PTO Implement End Yoke part numbers: 800 3520, 8003520. FREE SHIPPING!!! Center of Bearing to End of Yoke 4 1 4 inch Cross and Bearing Cap Diameter 1 1 4 Inch 31. 75mm Cross and Bearing Overall Length 3 7 32 Inch 81. 74mm Implement Yoke Bore Shape Round with Keyway Implement Yoke Bore Size 1 1 4 Inch Keyway Size 1 4 Inch PTO Implement Yoke