This listing includes Carburetor Stud Mounting Hardware (2 or 4 Barrel), 1 Carb Throttle Return Spring, and 2 Polished Stainless Steel Air Cleaner Wing Nuts (correct, as pictured). These fit Carbureted Engines. 

These also fit Holley & Demon Carbs.

This listing includes the following:  

• (Quantity of 4) Grade 8 Carb Studs -- 5/16-5/8 SAE x 5/16-3/4 USS, 1-1/2" Length, High Strength
• (Quantity of 4) High Alloy Lock Washers -- 5/16" Bolt Size
• (Quantity of 4) High Strength Flat Washers -- 5/16" Bolt Size, 11/16" O.D.
• (Quantity of 4) Hex Nuts -- 5/16-18 USS, 1/2" Hex
• (Quantity of 1) Throttle Return Spring (Approximately 5" Long)
• Throttle Return Spring is 2-1/2" Long, Coil Diameter is 1/2", Wire Size is 1/16" in Diameter
• (Quantity of 2) Polished Stainless Steel Air Cleaner Lid Wing Nuts
• Easy Install
• Show Quality