i would NOT mount any horn inside the fender well
dirt, mud, water and crud will hurt the horn as well as plug it up w/ dust.

try the front of the radiator for the pair of Hi/Lo tone ones. aim the openings down or slightly towards the rear

Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe
Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE