This is a "BILLET ALUMINUM THROTTLE BODY VACUUM BLOCK" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This item replaces the stock cheap plastic piece. Our Vacuum block comes complete with 2 stud bolts, and a gasket. (Brass fitting not included). This item is made in the U.S.A. and has a billet machine finish to it.