New Dorman exhaust manifold stud kit.  This kit includes 6 metric studs and matching nuts.  Thread is M10x1.5x62mm long (approx. 2.44").  This fits many other applications also requiring M10 studs.

94-96 LT1 Corvette

93-97 LT1 Camaro/Firebird
98-02 LS1 Camaro/Firebird

99-14 LS based trucks