go to NAPA, they have acatalogue in full color, and to scale sizes with all thier gaskets in it, the one that comes to mind is a 300zx turbo i think.

but if your turbo inlet is good and the manifold as well, screw it, i have never used one yet, not on my drag kit and not on my equal length either, shit there isnt even one on there now with my brand new turbo either. and as far as the 5 bolt flange i dont either, every time i tried one of those they blew out.

i know 60-1ek uses one on his turbo, so there are people that use them, i just got tired of dropping the turbo form a blown gasket.