Train Horn For H2

[Linegod]

Im not sure if I was asking at this point in time about a train horn to be mounted on a 2004 Hummer H2...If not do you know of a place on the web where I can find out where they are mounting these things? There isnt enough room under the hood..The horn is chrome and has three "Horns" attatched to a base with a seperate compressor tank measuring approx 8" wide by 18" long..The horns measure to the best of my memory about 18" across and 22" long I mean they are a monster. Would appreciate any help you can give.
Thanks