They definitely fit behind the grill of a 04 fxt.
Put more effort into it. It literally took 1 minute of figuring out where the horns were hitting the grill and grinding a little plastic down with a dremel to get them to work perfectly.
Also don't bother spending the money on one of those overpriced brackets.
I got a small section of din rail from a hardware store, painted it and used that to mount them. The other advantage of it is that it allows you to mount the horns farther apart so the car doesn't look cross-eyed.