You can find all the replacement parts you need at Escapa.
Union CB-774 Headset Bearing 40.0x51.0x6.5 36/36
Features:
-Dimensions: 40.0x51.0x6.5 36°/36°
- Outer and inner rings: CrMo
- Balls: CrMo (HRC 61-66)
- Cage: Nylon
- Seals: LLU rubber (full Contact)
- Grease: Multemp SRL (Kyodo Yushi)
- Tolerance: ABEC-3
