Originally Posted by Diesel911

Notice the difference in the size of the Parts between the 2 Injector Bodies. The internal parts are also a different size.

If you take these Injectors apart keep all of the parts that came from that one Injector together.

If they are used as whole/complete Injectors and the Injector Nozzles are the same and the Pop Pressure is the same both style Injectors can mixed together and used on the same Engine (that is in the Manual).

The one on the bottom is the older style.