Little help ?

what you have here in that picture are the two options

you either use the right angle, or the plate with the arrow on it
(you dont have the nipple in the picture that is used to bolt the plate on, but it is the same nipple that should be screwed into the adapter allready, where the filter goes)

some people dont seem to be able to get the right angle to fit without it leaking
in my experience, the trick to not get it to leak is to hold it with a crescent wrench while torquing down the hollow bolt

that keeps it from twisting and breaking the gasket