From the following site, there were only supposed to be 5700 made total. I have a white GT with the 40th anniversary package. There is also a black version of the package.
"All 2004 Mustangs except Cobras wore 40th Anniversary fender badges, but not every one was a 40th Anniversary Edition Mustang. The 40th Anniversary Edition package was available on V6 and GT models. It came in three colors including Black, Oxford White, and Crimson Red, which was only available on the 40th Anniversary models..... Ford made 5700 of them. The package was an $895 upgrade."
http://bradbarnett.net/mustangs/timeline/99-04/04/40th.htm
So if 4,529 are crimson red, then the rest were white or black...for a total of 5700 total made.. I really dont think that breakdown is correct..
Cheers!