You can find all the replacement parts you need at Escapa.
Union CB-740 Headset Bearing 31.0x41.8x8 45/45
Features:
-Dimensions: 34.1x46.8x7 45°/45
- Outer and inner rings: CrMo
- Balls: CrMO (HRC61-66)
- Cage: Nylon
- Seals: LLU rubber (full Contact)
- Grease: Multemp SRL (Kyodo Yushi)
- Tolerance: ABEC-3