52-53 Merc horn location

[Robz51]

My 52 Merc was missing the horn assemblies when I got it from my dad. When it was changed over to 12 volts he must have removed them because it now has some cheap aftermarket horn. I have since bought some replacements with original brackets but not sure where they mount. I seem to remember them down somewhere on the bottom of the radiator support. Any help or pictures would be greatly appreciated.
Thanks, Rob