6.0L Ford Powerstroke Fuel Injector
Engines built BEFORE 9/22/2003

6.0L Ford Powerstroke Fuel Injector 
Engines built ON or AFTER 9/22/2003

7.3L Ford Powerstroke Fuel Injector
Solenoid code AD - use in cylinders 1-7 (Cylinder 8 is optional)
Engines built AFTER 12/7/98

7.3L Ford Powerstroke Fuel Injector    
Solenoid code AE - use in cylinder 8 to eliminate "cackle"
Engines built AFTER 12/7/98

7.3L Ford Powerstroke Fuel Injector   
Solenoid code AB
Engines built BEFORE 12/7/98

7.3L Ford Powerstroke Fuel Injector Solenoid code AA