if you are doing a gen 5 swap, you are going to need a gen 5 supercharger gasket, not a gen 3 like that one is.
uuuhhh.... check the listing again? Clearly shows a metal S/C gasket (unless the photo is incorrect), afaik the gen 3 never had a factory metal gasket replacement, only paper.
2003 Grand Prix GTP.... the journey begins again....
E85 Self Tune with HPT, 80# Injectors, Gen V 3.4 pulley, SD Headers, AL605 Plugs