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They will bolt right up to your 04 although you will be down grading in shock. The 04's got new valving and are considered very good to say the least. Stick with your 04's unless you want to step up to an adjustable setup.
They are tuned for a different car ... the C5 Z06 2004 shocks were tuned for the car with extensive testing at Milford and at the Nurberging ..... keep what you got.
And here's a link for you ... read posts 16 and 17 ... then realize it is not neccesarily in Pfadt's "best interest" to give you the straight story on shocks .....