i have a force 90 hp 1999 model and i took the lower end off to put a water pump and new gaskets in it everything went well but i noticed that when i took it out there wasnt a seal that slides down the shaft over top of the impeller housing and there wasnt one in the kit and i dont see it on the drawing does this particular model have one ? ive only ever worked on a mercury and it had the seal any help would be appreciated thanks