GM ACDelco - OEM L32 Supercharger Gasket #GM-12574474
is for the Gen V
Oreilly's: List: Plenum Gasket Set - 2004 Pontiac Grand Prix | O'Reilly Auto Parts
I know the old Gen V gasket is a different material compared to the Gen III gasket, much more stiff. The one I took off looks to be in great shape, but I assume they are not reusable?