a seal like a doughty type washer ( may have that spelt wrong )
which is like a metal ring with a rubber in-sert in the middle?
if so just hit down to your local hyd shop and get some simple fix
shit me that looks like the old water trap of a xa coon of sorts ( how i miss that whale of a car )
fyi
alot of parts places dont list these as water trap/seperator filters they have them down as fuel filters, and most young cats will not know what one is
but i would also try any ford/holden wreaker