Engine Block Heater Element is a direct fit for the following:

1997-1999 Ford F-250
1997-1999 Ford F-3501999-2003 Ford F-250 Super Duty
1999-2003 Ford F-350 Super Duty
1999-2003 Ford F-450 Super Duty
1999-2003 Ford F-550 Super Duty
2000-2003 Ford Excursion
1997-2003 Ford E-150
1997-2003 Ford E-250
1997-2003 Ford E-350
1997-2003 Ford E-450

-With 7.3L Diesel Engines

Genuine Ford Part Number: F7TZ-6A051-AA