Went looking for OEM tail lights today for my 07 GT CS. Ended up at Pic a part in Columbia Station, Ohio. They handle high end salvage and had a couple of Shelbys, as well as newer corvettes, ZO6's, a Viper and new GTO's. They advertise that they are the # 1 GTO PARTS DEALER IN THE WORLD!!!
They were great to deal with and sold me like new OEM taillights for much less than ebay..
http://www.clevelandpickapart.com/
Just thought I would post the info as a great source of parts... their link is here:
Mods... I hope this is in the right place. It only pertains to the new GTO's
Parts source
Threaded Mode