You can use them, but I have been weary about using old pads on new rotors. Your pads took the shape of your old rotors, and if they were warped or anything, they could possibly been worn in a way that would not mesh to well with your new discs. The pads would have to basically reshape themselves to the new rotors if that makes sense. This mainly the front set of pads I am talking about, seeing as how our brakes mostly use like 80% front brakes as compared to the rear brakes that get worn very little.

I personally would look for the Posi Quiet ceramic pads, they came with my setup for my R1 rotors and I could not be happier with them. And they are fairly cheap to come by as well.

The worst you could do is take say the front ones back to Autozone, and say they were failing or something to where they would swap you a new set, if you did not wish to spend the money on new pads. I know that is kind of decietful, but if you dont wish to spend the extra cash, your options are kind of limited. The rear pads should be fine seeing as how they get used so little in our cars. I didnt swap out my rear pads on my old GT until hit 120k miles. That is how little they get used

Here are some I found on eBay. They are for the Monte Carlo, but they work just the same on the GPs.

http://cgi.ebay.com/ebaymotors/Posi-...3134QQtcZphoto

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James Shafer 2003 GP GTX St. Louis MO
1.9 Modified Rockers, TOGs, 180 Tstat, PRJ 10.4 Wires, P/P Gen 3, SLP Ram Air Hood/Wizaired CAI, Gen 1 Spoiler, 3.5 Pulley, 18" TSW Mondellos w/ AGX Struts, SSC Gen II Springs