no they wont work... the offset for 04-94 mustangs is around +24, you need... actually i dont know about the newer GP's... anyway i assume it's the same but who knows, but you need +35-42 mm offset for the 97-03 GP's but now that i think about it, idk about the 04+ but the only problem is going to be offset...
ya i did some research and the offset on the 04+ GP's is the same as the 97-03's... if you would like to have them stick out hella far that would be fine, but you'd probably be flamed... a lot...
can you post up some pics? i have a friend that has an 03 V6 and he's always looking for stuff... or u can email them to me @ baller4real3000@aim.com thanks man