Im looking at getting another set of fuel injectors off of ebay. I've noticed there are 2 styles. The style I have (plump metal bottom) and what would be an all plastic style (skinny). I pulled my fuel injectors and cleaned them! Well not as good as it should have been I guess.

 

If the connector is the same, either style will work. I actually have a set of 21# injectors from a Dodge in my 99 5.4. Anything with an EV1 connector will fit, the skinny 'new style' atomize fuel better than the older more round body that came out in the early 80s.

https://www.injectorrx.com/bosch-fuel-injectors/

The middle EV1 male connector is the older Ford style.