Hey Junk.... Here's the 411 on the horns.
They're made by Carrand Horns. I got them at a GI-Joes store. Not sure if you've got those in your parts. They're called the "Magnum Blaster Horn", and no I didn't swipe em off a Durango.

29.98 for the pair. One is a high note, and the other a low note. If they had a middle note, I woulda bought that sucker too. They're 138 decibles. Quieter than the 4 Cadillac horns I used to run on just about all my cars. Found em in a wrecking yard in 1979 in a 66 Fleetwood, and had em till last year. They took a little fitting, but it was worth it. My favorite, was putting them in a 1990 Geo Metro I bought for running around at work. Sounded like a freight train, and nobody could figure out where the noise was coming from. But, they did get out of my way.
Oh... back to the horns.

I finally smoked the old Caddy horns in a honking fit, so I tossed em. These things are pretty loud, and fit in nicely where the factory horns go. When I first installed them, they sat a little high, and one was just about touching the hood when closed. Installed as flws:
1) Made up a new "wiring harness" for them with new female ends
2) Soldered it to the factory harness
3) Trimmed the lip on the factory mounting arms so I could swing the horns downward a bit.
4) Bent the arms back toward the radiator a little, to keep them from rubbing.
5) Plug in and honk.
You can see in the pictures. I put a couple up on my Fotki site. There's one picture of the package below and the others you can link to. So I'm not being a bandwidth whore with too many pix. :
The others are here....
http://public.fotki.com/GoKart3/landcruiser_stuff/misc_cruiser_pix/
If you want the horns and can't find em, PM me. I'll pick up a pair and send em to ya.