WTB Hemi Air Horns
You can get these at your local Dodge dealer (but the price may give you a heart-attack).
Here is the part number:
P5007809
Cross Ram Carburetor Air Horns
For use with Holley Cross Ram Carburetors. Perfect for Super Stock competition
or restoration. Sold as a pair (front and rear).
P5007809 Air Horns, 1964-65 426 Hemi, 1968 Super Stock 426 Hemi