I would find out who the maker of the Head gasket is, like Felpro or some sort. I've usually had good luck w/ Napa's parts, and I beleive most of their gasket items Are Felpro now adays. Which, in my opinion, Are very good gaskets.
I wanna say the square ones are used with the intake manifold in some way, don't hold me to it though, didn't use mine that came with my kit either =P

2000 Audi TT 1.8Turbo Quattro
1988 Chevy Camaro - 100% Built + for sale!