The Ders

I just bought some new axle backs and threw them on my car this weekend. I had a pair of axle backs directly off of a GT500 on my car. I have a 2010 GT and was planning on selling the ones I just had on the car and was wondering if anyone can help me in terms of fitment of Year to Year for the exhaust? I'm assuming they'll fit 05-10GT's since that's the general fitment of a lot of other axle backs. But what year of GT500's would be proper to put? (I don't know which year GT500 they came off of, a friend had them sitting in his garage and told me I could have them if they fit, and they did.)

Just wanting as much proper info as possible to put in my ad for selling them on eBay.

Thanks , Ders.