Hi, you can get new quarter panels from Mustangs Unlimited. EBay is another good source and will become one of your best friends as long as you own your Cobra II. If you're on Face Book check out the Cobra II forum and the Mustang II forum. A bunch of people there willing to help. And check out www.mustangii.net
for solutions. If you've got a problem or question somebody there has already been through it and can either tell you how to fix it or at least point you to someone who can. As far as your rust repairs? That's just old fashioned body/resto work. Good luck!!