Hey i just did a quick search and found this
http://www.stangnet.com/mustang-forums/565657-replacement-03-04-mach1-hood-where-buy.html
Scroll down to this user and maybe drop him a PM,he has already done it.
user name:GT-03
This is what he had to say in his mods list link.Hope it helps.
So, I had been wanting for a long time, to buy a shaker kit for my Mustang. However, I was hesitant to start ripping apart my brand new Mustang. What really got me to finally take this step, was that I was the chance finding of a Mach 1 hood in excellent condition for sale, and in just the right factory color. A perfect match! Plus it had the hood stripe, the under hood blanket, trim ring, and engine decal too. That made the hood itself a simple "bolt off the old, bolt on the new" activity.
With the hood taken care of, the shaker "ram air" kit itself, can easily be installed in under an hour. Except for a custom front bracket and a custom rear bracket, needed because of the GT having the 16v engine instead of the Mach 1's 32v engine, everything else in the kit are authentic Ford parts.
You can buy the Shaker "Ram Air" kit from KarKraft.