"I'd locate the correct o-rings and the neoprene seal is the way to go "
I used the neoprene gasket only, no silly cone, just making sure that it was to be used in lieu of the goo....
I need to better assess the o-ring in question to assure a good seal
Boat may come out this weekend for it's last ride the way it sits then it goes into my shop to be completely torn down and re-done, re-built, made as close to new as possible.