Have you looked at mustangsunlimited.com and 50resto.com? That is where I would start. Give them a call. You could also try mpsautosalvage.com and prestigemustang.com, maybe they have a decent interior out of a wrecked car that is the right color...
To my knowledge, none of the aftermarket carpets available have the holes cut.
Locating the holes & cutting them isn't hard at all, just a little time consuming. I usually take the new carpet & flip it upside down (fuzzy side to the floor) & lay the original carpet over top of it (fuzzy side down). I then take a permanent marker & mark the holes & outer edges. Then it is just a matter of doing some work with a razor blade.
Normally customers find the normal ACC carpet to be a bit more pliable than the factory stuff, but if you desire a carpet that is more comparable to the factory stuff, try out the ACC Mass-back.
Dude i looked for almost 9 months.Best bet is checking EBay or somewhere for a good used one.I bought one from mustangsunlimited.com and it was a pain in the ass to install.I HATE IT!
Yeah they are. and if you are a little bit off it looks horrible. Plus, the ACC carpet doesn't like to stick to anything even with liberal amounts of glue.