You can find all the replacement parts you need at Escapa.
Union CB-101 6803 2RS 17x26x5 Ball Bearing
Features:
- Dimensions: 17x26x5
- Outer and inner rings: CrMo
- Balls: CrMo (HRC 61-66)
- Cage: Steel
- Seals: 2RS rubber (light contact)
- Grease: MULTEMP SRL (Kyodo Yushi)
- Tolerance: ABEC-3