I put these in the headlights of my John Deere X324 lawn tractor/mower. Perceptually, these are least twice as bright (maybe even 2 stops, photographically speaking) than the original 1156 incandescent bulbs. The originals were not old, either, they were barely used. As the days get shorter now I have to mow in the twilight and on into dark and it is really easy now to see where your last pass was. That was not the case with the 1156. Too many bugs, though. ;) I'm sure these would also fit X300, X304 and X320.