oil filter/ex manifold interference Q

it is tight but I could go with either one. the only caveat on the 90 deg one is to duplicate the "angle" of it that it is at right now on the mockup eng cuz I cant install the ex manifold on the in the car engine till I cut the inner fenders out which needed to be done anyway including some of the fender area at the UCA mounting points which is the manifold interference area. On the flat plate/nipple do you use any gaskets on either side of the nipple? If I go with the plate & I likely will I will drill some extra holes in the plate for more flow.