Where can I find intake port plugs for SB2 1st gen. heads?

[efamous]

I need help, I'm ready to put my new combo together have all new parts but have been unable to locate these intake port plugs. Any help is greatly appreciated (Manufacturers name etc...)
Thanks

[billhendren]

They are available at your G.M. dealer only,there is two different sizes depending on the year of your heads.Bill

[alscoupe]

:D Bill, you da man!