you ONLY need the 70078
(for sake of clarity...)
the round cork one is to seal off the large bolt and keep oil from bypassing the filter
you will not use that bolt so your fine
just be sure that everything is clean, the plate your using is still flat, everything is clean, and the center of the plate does NOT contact the block before outer edge is seated on the block
oh, and make sure everything is clean
while you are in there, you may want to see how many holes are in the plate, and if the answer is four, drill four more in there to increase the flow
just be sure chamfer the edges of the holes and clean everything