rear main seal leak

does someone have the correct rear main seal part number
to be able to run a scat rotating assembly

I send an email to scat and there answer was
call chrysler they use the same cranck and theyt doesnt seem to leak

on the first install I use a 1973 style seal it leaks and leaks bad
I switch to a 2003 5.9 seal it seem to be ok for a while
but now it leak ans when I say leak it leak really bad
every time I starte the engine and I shut it up after maybe 5 minutes
or get in high rpm and can make a 5'' mark on the asphalt

any help will be appreciate

Bob