The injectors are the same as the mustangs. You could just use 24 lb injectors from a stang and such, but you really aren't going to need them. the 19's will actually support about 400 hp or so before you start really leaning out. There's quite a few GEN 1's in the 12's on 19 lb injectors. If you do change injectors you'll have to get a chip burned for your computer.
Just tell them they were highly recommended by the National Lightning Owners Club.
Good luck with the mods.