Like he said you should have ordered the gasket. 2.5 in size that is too thick and you might not have a good seal. But you can try and let us know.
My gasket are blown too. I bought a gasket from Z1.
Z1 Metal HR/VHR Manifold 3 Bolt Gaskets
They have the 2 bolt gasket available. Call them before you order.
Or just follow the link posted by infiniti.