Start visiting salvage yards, my friend!
There are even yards that specialize in Fords, specialize in Mustangs, etc. That's the only viable way to get what you need. Most of the stuff is probably still available from Ford, but you may as well buy a new car.
Do you just need the dash and console, or everything behind the dash too? That's going to be a big job- I don't think I've heard of it being done before. Hopefully you are able to find a wrecked Stang with an identical dash and remove the whole thing with as little disassembly as possible.