MR4-BX worlds front one way

[woodey]

Does anyone know the part number for a one way for the MR4-BX worlds spec. I bought a one way from someone at my local club, and I guess this must be for a standard BX, as the drive cups are really short compaired to the worlds. While it sort of fits, the drive shafts are right on the end of the cups, and pop out when on full droop.

Thanks