No.
http://www.mustangheaven.com/Production Numbers/s197Mustang.htm
In 2005, 60k Mustang GT's. I'd expect 07' to be less. I'd wager 1 in 6 2007 V8 Mustangs is a GT500. Not rare.
THEY SAID 160,000 NOT 60,000. THATS 1 OUT OF EVERY 16 MUSTANGS.:read: