Rover 45 ixl diesel gearbox driveshaft seals

Hi i have a 2002 rover 45 ixl diesel .. was doing a diy service today and i have found that my nearside driveshaft input seal is leaking . does any one know what part number i need as i have been told some replacement after market seals do not fit correctly .. i only need the nearside passenger seal only.. any links or advice please i would be very greatfull

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