1.570 OD X .75 ID bearing. Old Part no. 6151. Spacer no. 6024. Shafts-6046 center, 6047 outer. Hub 6043.
If hub is bad, you must replace entire assembly with part no. 6000 for Center blade and 6001 for Outer blades.
This part is pretty much obsolete. Most have been replaced with newer styles.