Up for sale are stock speakers from my 2003 CTS. They will fit 03-07. I replaced all of the speakers except for the tweeters. They are just sitting in my garage not being used. Make a decent offer and they're yours.
In addition, I have a driveshaft minus guibos (flex discs) for sale. I purchased a new mount for it that will come with it. Make an offer on that as well and its yours. I'm not sure what shipping cost is but it shouldn't be much. If you want to arrange your own shipping that'll work too.
Send me a PM.