Manufacturer Part Number: 14186001. Interchange Part Number: 14186001. Other Part Number: 14186001. Carburetor Square Flange 4 Barrels 1912-800 For 1912 Thunder Series Avs2 800 Cfm. 1903 Carburetor 500 CFM 4 Barrel For Avs2 Series Electric Choke Square Flange.