1962-1965 BIG BLOCK COMPLETE EXHAUST MANIFOLD FASTENER KIT. KIT INCLUDES THREE LONG SLEEVE NUTS, TWELVE 3/8" NC/NF STUDS, AND NINE 3/8-24UNF GRADE 8 NUTS. USED ON 361, 383, AND 426 STREET WEDGE BIG BLOCK ENGINES WITH EXHAUST MANIFOLD CASTINGS 2203 262 AND 2205 898.