SPINDLE PART NUMBER GY20785 GY20050 SPINDLE SPECS: 6-3/8″ overall 42″ 44″ 46″ and 48 decks NOTE: Mounting holes do not have thread. BELT PART NUMBER 10437 GX20305 GY20571 BELT SPEC: Width 1/2″ Length 139″ MOWER DECK BLADE PART NUMBER GX20250 GY20568 330619 BLADE SPEC.