Carburetor Studs - 2" overall. 5/16"18 on one end and 5/16"-24 on other. This is standard for almost every carburetor and manifold ever made.
5/16 Carburetor Carb Intake Studs 1-3/8" Nuts & Washers Holley Edelbrock A120
5/16 X 3" 3-5/16" Carburetor Carb Intake Studs Nuts Washer Holley Edelbrock A124
ARP 200-2401 Carburetor Carb Stud Kit Black Oxide 5/16 x 1.700" OAL Hex Nut
1-3/8" Carburetor Carb Stud Kit For Holley Edelbrock Demon Rochester Quadrajet
R0977 RPC 3-3/8" Carburetor Carb Stud Mounting Kit w/ Nuts & Washers 5/16-24