freight train

Hi everyone. I have tried to look up the part number but have had no luck. Does anyone happen to have a factory parts manual for a 1994-2004 truck with a NV4500 that would be able to provide the Mopar # for that small seal that goes inside the bearing retainer? Or if anyone has replaced this seal and knows the brand and part number for it please help me as I am sure Mopar probably buys it from CR or similar company. Any help would be greatly appreciated, thanks

Robert