2000 DS 650 oil going into starter problem

Hi there I’m new to this forum stuff have used them for years to solve problems with my toys but ic come across a problem I can’t seem to find any answers for and the dealer is no help unless you bring it to them lol. Anyways I have a 2000 DS 650 and I’m getting oil into my starter and had caused the starter to not work anymore and from what I understand is the stator is a wet bath stator and I believe that means there’s always oil on that part of the casing so does anyone know if there’s a seal or something on the starter to stop the oil can I get this seal anywhere and had anyone else had this issue