Here is a New Holley adjustable fuel pressure regulator. Part number 12-886.
For Holley 12-803 2 Port 4 1/2 to 9 PSI New Carburetor Fuel Pressure Regulator
For Holley 12-803 2 Port 4 1/2 to 9 PSI NEW Carburetor Fuel Pressure Regulator????
New Carburetor Fuel Pressure Regulator For Holley Carburetor 12-803 4.5-9 PSI
Holley Fuel Pressure Regulator 4.5-9 Plus 0-15 Marshall LF Pressure Guage
HOLLEY Fuel Pressure Regulator Diaphragm REPAIR KIT QUICK FUEL 35-100
Two New Holley Carb Pressure Regulators
