These are EV1 injectors for older fuel-injected Mustangs. On top is a 19 lb/hr injector for 5.0L High Output and 4.6L SOHC engines. Below is a 22-lb/hr MSD injector. Flow rate is identifiable by injector color. Where it gets tricky is fuel rail fit. Not all aftermarket injectors will fit your Mustang's fuel rail because the length isn't always exact.