You can find all the replacement parts you need at Escapa.
Union CB-776 Headset Bearing 40.0x51.8x7.5 36/45
Features:
-Dimensions: 40.0x51.8x7.5 36°/45°
- Outer and inner rings: CrMo
- Balls: CrMo (HRC 61-66) - Cage: Nylon
- Sealing: LLU rubber (full Contact)
- Grease: Multemp SRL (Kyodo Yushi)
- Tolerance: ABEC-3