2007 Mazda 3 S GT
latest version is LF8M-18-9E1H . That is what you want to use. If you find a used one LF8M-18-9E1* has match your existing one or newer suppression. If you happen to just find matching, you can use it and go to your nearest dealership and ask for the current tcm update, although expect a charge. Unfortunately LF8M are on a national back order from Mazda.