Our 7.3L Stock HEUI injectors are backed with our quality customer service and support. We offer code AA, AB, AD and AE for your 1994-2003 7.3L Powerstroke or T444E engine. Be sure to check your code on your existing injectors, as all cores must be like for like. We hate to say it, but don't assume. If you are not the original owner of your vehicle, there is a fair chance the injectors have been changed, and may be the wrong type for your model year. 1999 and later use 7 AD injectors and one AE injector in the #8 hole. Be sure to order the quantity and type you want. All injectors come with new seals and gaskets.