Stupid question, but why not see about ordering an OEM horn, or pull one from a wrecker yard? Sure fire fit at least, anything from a wrecking yard is a gamble...

 

True, but since the Supertones are already here, why not mount them somewhere between the rad support and the front bumper cover? At most, it would be a matter of extending the wire and drilling a hole to mount them.

 

butt seriously...
install 2 S197/S550 horns